Add support for Python 3.11 final

[hugovk]

Contributor checklist

• Provided the tests for the changes.
• Assure PR title is short, clear, and good to be included in the user-oriented changelog

Maintainer checklist

• Assure one of these labels is present: backwards incompatible, feature, enhancement, deprecation, bug, dependency, docs or skip-changelog as they determine changelog listing.
• Assign the PR to an existing or new milestone for the target version (following Semantic Versioning).

Add the Trove classifier.

For what version range should 3.11 be added in this table?

https://github.com/jazzband/pip-tools#versions-and-compatibility

[webknjaz]

@hugovk I think there's another workflow file that would also need to be updated.

[hugovk]

This is the only one:

$ git grep 3.11-dev
$ git grep 3.11
.github/workflows/ci.yml:          - "3.11"
CHANGELOG.md:- Test on Python 3.11 ([#1527](https://github.com/jazzband/pip-tools/pull/1527)). Thanks
piptools/_compat/pip_compat.py:# pattern. In pip 22.1, importlib.metadata became the default on Python 3.11
setup.cfg:    Programming Language :: Python :: 3.11
tests/test_cli_compile.py:            --hash=sha256:c2b0134119a624f4ac9398b44f8e28a01c7686ac350a12a74793f3dd57a9eea0
tests/test_cli_compile.py:            --hash=sha256:c2b0134119a624f4ac9398b44f8e28a01c7686ac350a12a74793f3dd57a9eea0