- Removed pins to old version of setuptools.
- Added py312 section to tox.ini [testenv]
- Updated flake8 to 7.1.1 instead of 3.9.2
- Fixed pep8 failure in unit test
- Enable upstream testing for py312
Change-Id: Id0b75bd5a7e6954f19dbea25e08187ae62d3c6d9