[auth-backends]: Add Support for Python 3.11 and 3.12

[awais786]

Description

Follow and Complete all of the following steps for the issue to be marked as done.

• Update tox & Github action workflow to add support for Python 3.11 and 3.12
• Update the trove classifiers in setup.py, setup.cfg or pyproject.toml files.
• Run and verify all tests are passing in the CI for Python 3.11 and 3.12
• Add CHANGELOG entry with description “Support added for Python 3.11 and 3.12”
• Bump the package version and release a new version on GitHub & PyPI (whichever is applicable)
• Fix any failure or error. For complex failures add new sub ticket.

Repo link
https://github.com/openedx/auth-backends