Add Support for Python 3.12

[irtazaakram]

Description:

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

• [x] Update the tox.ini, setup.py, setup.cfg, or pyproject.toml to add Python 3.12 to the supported versions list.
• [x] Ensure GitHub Actions workflows, particularly the CI matrix, reflect Python 3.12 as a supported version.
• [x] Review and adjust any build or testing configurations to ensure compatibility with Python 3.12.
• [x] Run all tests and verify they pass in the CI with Python 3.12.
• [x] Add a CHANGELOG entry: “Added support for Python 3.12.”
• [x] Bump the package version and release a new version on GitHub & PyPI (if applicable).

[iamsobanjaved]

PR to drop support for Python 3.8

• https://github.com/openedx/edx-drf-extensions/pull/474

@huniafatima-arbi kindly complete if any item is pending from the checklist otherwise close the issue.