Update tox requirement from <4 to <5

[dependabot]

Updates the requirements on tox to permit the latest version.

Release notes

Sourced from tox's releases.

4.2.6

What's Changed

• Handle properly pip --no-binary / --only-binary options in requirements.txt format files. by @​q0w in tox-dev/tox#2834

Full Changelog: tox-dev/tox@4.2.5...4.2.6

Changelog

Sourced from tox's changelog.

v4.2.6 (2023-01-06)

Bugfixes - 4.2.6

- Handle properly pip ``--no-binary`` / ``--only-binary`` options in requirements.txt format files. (:issue:`2814`)
v4.2.5 (2023-01-06)
Bugfixes - 4.2.5

• The combination of usedevelop = true and --skip-missing-interpreters=false will no longer fail for environments that were not invoked - by :user:stephenfin. (:issue:2811)
• Fix an attribute error when use_develop = true is set and an unsupported interpreter version is requested - by :user:stephenfin. (:issue:2826)
• tox returns a non-zero error code if all envs are skipped. It will now correctly do this if only a single env was requested and this was skipped - by :user:stephenfin. (:issue:2827)

v4.2.4 (2023-01-05)

Bugfixes - 4.2.4

- Setting ``[testenv] basepython = python3`` will no longer override the Python interpreter version requested by a factor,
  such as ``py311`` - by :user:`stephenfin`. (:issue:`2754`)
- Also accept tab after colon before factor filter expansion - by :user:`pdecat`. (:issue:`2823`)
v4.2.3 (2023-01-04)
Bugfixes - 4.2.3

• devenv does not respect the specified path when the package is a wheel file - by :user:gaborbernat. (:issue:2815)
• Require space after colon before factor filter expansion, unless it is the last character of the line - by :user:pdecat. (:issue:2822)

v4.2.2 (2023-01-04)

Bugfixes - 4.2.2

- Add ``CC``, ``CFLAGS``, ``CCSHARED``, ``CXX``, ``CPPFLAGS``, ``LDFLAGS``, ``PKG_CONFIG`` and ``PKG_CONFIG_SYSROOT_DIR``
  to the default passed through environment variables list as these are needed for building various C-extensions
  - by :user:`gaborbernat`. (:issue:`2818`)
</tr></table>

... (truncated)

Commits

• fd866d5 release 4.2.6
• e9d6e63 Handle properly pip --no-binary / --only-binary options in requirements.txt f...
• b9b4d02 release 4.2.5
• c790c60 Fix various issues with missing interpreters (#2828)
• af35384 release 4.2.4
• fc289c0 Fail on mismatched python spec attributes (#2824)
• af4b558 Also accept tab after colon before factor filter expansion (#2823)
• f07335d release 4.2.3
• 4eed8d5 Fix devenv when package for env is wheel/editable (#2820)
• 497c17c Require space after colon before factor expansion (#2822)
• Additional commits viewable in compare view

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[codecov]

Codecov Report

Merging #159 (f41c074) into main (7152c43) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #159   +/-   ##
=======================================
  Coverage   73.34%   73.34%           
=======================================
  Files           8        8           
  Lines         664      664           
  Branches      176      176           
=======================================
  Hits          487      487           
  Misses        133      133           
  Partials       44       44           

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