chore: Upgrade Python requirements

[edx-requirements-bot]

Python requirements update. Please review the changelogs for the upgraded packages.

[edx-requirements-bot]

List of packages in the PR without any issue.

• build changes from 1.5.0 to 1.6.0
• cachetools changes from 7.1.7 to 7.1.8
• click changes from 8.4.2 to 8.5.0
• coverage changes from 7.15.4 to 7.16.0
• coverage[toml] changes from 7.15.4 to 7.16.0
• filelock changes from 3.32.4 to 3.32.5
• platformdirs changes from 4.11.4 to 4.11.7
• pylint changes from 4.0.7 to 4.0.8
• python-discovery changes from 1.5.3 to 1.6.0
• tox changes from 4.60.1 to 4.61.2
• virtualenv changes from 21.7.5 to 21.7.8

[edx-requirements-bot]

These Packages need manual review..

• [MAJOR] isort changes from 8.0.1 to 9.0.1
• [NEW] mypy-extensions (1.1.0) added to the requirements
• [MAJOR] readme-renderer changes from 45.0 to 46.0

[rahulkanneri-2u]

Verified locally: no breaking changes.

I checked out this branch, installed the updated pins in a clean Python 3.11 venv, and ran the project's own test and quality checks against them:

• Full test suite still passes (11/11, 100% coverage), confirming the library's actual behavior is unaffected.
• Ran pylint, isort, and pycodestyle with this repo's configs, all clean, no new findings from the bumped versions. Specifically checked isort since it jumped a major version (8 -> 9), which can change import-sorting defaults; no diffs found, so the quality CI job stays green.

LGTM