Update gunicorn to 21.2.0

[pyup-bot]

This PR updates gunicorn from 19.8.1 to 21.2.0.

Changelog

21.2.0

===================

- fix thread worker: revert change considering connection as idle . 

*** NOTE ***

This is fixing the bad file description error.

21.0.1

===================

- fix documentation build

21.0.0

===================

- support python 3.11
- fix gevent and eventlet workers
- fix threads support (gththread): improve performance and unblock requests
- SSL: noaw use SSLContext object
- HTTP parser: miscellaneous fixes
- remove unecessary setuid calls
- fix testing
- improve logging
- miscellaneous fixes to core engine

*** RELEASE NOTE ***

We made this release major to start our new release cycle. More info will be provided on our discussion forum.

20.1.0

===================

- document WEB_CONCURRENCY is set by, at least, Heroku
- capture peername from accept: Avoid calls to getpeername by capturing the peer name returned by
accept
- log a warning when a worker was terminated due to a signal
- fix tornado usage with latest versions of Django 
- add support for python -m gunicorn
- fix systemd socket activation example
- allows to set wsgi application in configg file using `wsgi_app`
- document `--timeout = 0`
- always close a connection when the number of requests exceeds the max requests
- Disable keepalive during graceful shutdown
- kill tasks in the gthread workers during upgrade
- fix latency in gevent worker when accepting new requests
- fix file watcher: handle errors when new worker reboot and ensure the list of files is kept
- document the default name and path of the configuration file
- document how variable impact configuration
- document the `$PORT` environment variable
- added milliseconds option to request_time in access_log
- added PIP requirements to be used for example
- remove version from the Server header
- fix sendfile: use `socket.sendfile` instead of `os.sendfile`
- reloader: use  absolute path to prevent empty to prevent0 `InotifyError` when a file 
is added to the working directory
- Add --print-config option to print the resolved settings at startup.
- remove the `--log-dict-config` CLI flag because it never had a working format
(the `logconfig_dict` setting in configuration files continues to work)


** Breaking changes **

- minimum version is Python 3.5
- remove version from the Server header 

** Documentation **



** Others **

- miscellaneous changes in the code base to be a better citizen with Python 3
- remove dead code
- fix documentation generation





================
Changelog - 2023
================

20.0.4

===================

- fix binding a socket using the file descriptor
- remove support for the `bdist_rpm` build

20.0.3

===================

- fixed load of a config file without a Python extension
- fixed `socketfromfd.fromfd` when defaults are not set

.. note:: we now warn when we load a config file without Python Extension

20.0.2

===================

- fix changelog

20.0.1

===================

- fixed the way the config module is loaded. `__file__` is now available
- fixed `wsgi.input_terminated`. It is always true.
- use the highest protocol version of openssl by default
- only support Python >= 3.5
- added `__repr__` method to `Config` instance
- fixed support of AIX platform and musl libc in  `socketfromfd.fromfd` function
- fixed support of applications loaded from a factory function
- fixed chunked encoding support to prevent any `request smuggling <https://portswigger.net/research/http-desync-attacks-request-smuggling-reborn>`_
- Capture os.sendfile before patching in gevent and eventlet workers.
fix `RecursionError`.
- removed locking in reloader when adding new files
- load the WSGI application before the loader to pick up all files

.. note:: this release add official support for applications loaded from a factory function
as documented in Flask and other places.

20.0

=================

- Fixed `fdopen` `RuntimeWarning` in Python 3.8
- Added  check and exception for str type on value in Response process_headers method.
- Ensure WSGI header value is string before conducting regex search on it.
- Added pypy3 to list of tested environments
- Grouped `StopIteration` and `KeyboardInterrupt` exceptions with same body together in Arbiter.run()
- Added `setproctitle` module to `extras_require` in setup.py
- Avoid unnecessary chown of temporary files
- Logging: Handle auth type case insensitively
- Removed `util.import_module`
- Removed fallback for `types.SimpleNamespace` in tests utils
- Use `SourceFileLoader` instead instead of `execfile_`
- Use `importlib` instead of `__import__` and eval`
- Fixed eventlet patching
- Added optional `datadog <https://www.datadoghq.com>`_ tags for statsd metrics
- Header values now are encoded using latin-1, not ascii.
- Rewritten `parse_address` util added test
- Removed redundant super() arguments
- Simplify `futures` import in gthread module
- Fixed worker_connections` setting to also affects the Gthread worker type
- Fixed setting max_requests
- Bump minimum Eventlet and Gevent versions to 0.24 and 1.4
- Use Python default SSL cipher list by default
- handle `wsgi.input_terminated` extension
- Simplify Paste Deployment documentation
- Fix root logging: root and logger are same level.
- Fixed typo in ssl_version documentation
- Documented  systemd deployment unit examples
- Added systemd sd_notify support
- Fixed typo in gthread.py
- Added `tornado <https://www.tornadoweb.org/>`_ 5 and  6 support
- Declare our setuptools dependency
- Added support to `--bind` to open file descriptors
- Document how to serve WSGI app modules from Gunicorn
- Provide guidance on X-Forwarded-For access log in documentation
- Add support for named constants in the `--ssl-version` flag
- Clarify log format usage of header & environment in documentation
- Fixed systemd documentation to properly setup gunicorn unix socket
- Prevent removal unix socket for reuse_port
- Fix `ResourceWarning` when reading a Python config module
- Remove unnecessary call to dict keys method
- Support str and bytes for UNIX socket addresses
- fixed `InotifyReloadeder`:  handle `module.__file__` is None
- `/dev/shm` as a convenient alternative to making your own tmpfs mount in fchmod FAQ
- fix examples to work on python3
- Fix typo in `--max-requests` documentation
- Clear tornado ioloop before os.fork
- Miscellaneous fixes and improvement for linting using Pylint

Breaking Change
+++++++++++++++

- Removed gaiohttp worker
- Drop support for Python 2.x
- Drop support for EOL Python 3.2 and 3.3
- Drop support for Paste Deploy server blocks


================
Changelog - 2020
================

.. note::

Please see :doc:`news` for the latest changes


================
Changelog - 2021
================

.. note::

Please see :doc:`news` for the latest changes

19.10.0

====================

- unblock select loop during reload of a sync worker
- security fix: http desync attack
- handle `wsgi.input_terminated`
- added support for str and bytes in unix  socket addresses
- fixed `max_requests` setting
- headers values are now encoded as LATN1, not ASCII
- fixed `InotifyReloadeder`:  handle `module.__file__` is None
- fixed compatibility with tornado 6
- fixed root logging
- Prevent removalof unix sockets from `reuse_port`
- Clear tornado ioloop before os.fork
- Miscellaneous fixes and improvement for linting using Pylint

19.9.0

===================

- fix: address a regression that prevented syslog support from working
(:issue:`1668`, :pr:`1773`)
- fix: correctly set `REMOTE_ADDR` on versions of Python 3 affected by
`Python Issue 30205 <https://bugs.python.org/issue30205>`_
(:issue:`1755`, :pr:`1796`)
- fix: show zero response length correctly in access log (:pr:`1787`)
- fix: prevent raising :exc:`AttributeError` when ``--reload`` is not passed
in case of a :exc:`SyntaxError` raised from the WSGI application.
(:issue:`1805`, :pr:`1806`)
- The internal module ``gunicorn.workers.async`` was renamed to ``gunicorn.workers.base_async``
since ``async`` is now a reserved word in Python 3.7.
(:pr:`1527`)

Links

• PyPI: https://pypi.org/project/gunicorn
• Changelog: https://pyup.io/changelogs/gunicorn/
• Homepage: https://gunicorn.org

[pyup-bot]

Closing this in favor of #824