Update pip from 22.2.2 to 22.3.1

[edmorley]

https://pip.pypa.io/en/stable/news/#v22-3-1
pypa/pip@22.2.2...22.3.1

Uploaded to S3 using:

$ pip download --no-cache pip==22.3.1
$ aws s3 sync . s3://heroku-buildpack-python/common/ --exclude "*" --include "pip-*.whl" --profile python --dryrun
(dryrun) upload: ./pip-22.3.1-py3-none-any.whl to s3://heroku-buildpack-python/common/pip-22.3.1-py3-none-any.whl
$ aws s3 sync . s3://heroku-buildpack-python/common/ --exclude "*" --include "pip-*.whl" --profile python
upload: ./pip-22.3.1-py3-none-any.whl to s3://heroku-buildpack-python/common/pip-22.3.1-py3-none-any.whl

GUS-W-11994775.

[edmorley]

https://devcenter.heroku.com/changelog-items/2496