Update pip from 22.0.4 to 22.1.2

[edmorley]

Applies to Python 3.7+ only, since all older Pythons are EOL and so are already on much older pip due to pip having dropped support for them some time ago.

Changes:
https://pip.pypa.io/en/stable/news/#v22-1-2
pypa/pip@22.0.4...22.1.2

Wheel uploaded using:

$ pip download --no-cache pip==22.1.2
...
Successfully downloaded pip
$ aws s3 sync . s3://heroku-buildpack-python/common/ --exclude "*" --include "pip-*.whl" --profile python --dryrun
(dryrun) upload: ./pip-22.1.2-py3-none-any.whl to s3://heroku-buildpack-python/common/pip-22.1.2-py3-none-any.whl
$ aws s3 sync . s3://heroku-buildpack-python/common/ --exclude "*" --include "pip-*.whl" --profile python
upload: ./pip-22.1.2-py3-none-any.whl to s3://heroku-buildpack-python/common/pip-22.1.2-py3-none-any.whl
$ rm pip-*.whl

GUS-W-11228793.

[edmorley]

https://devcenter.heroku.com/changelog-items/2425