chore: Upgrade Python requirements

[edx-requirements-bot]

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

Deleted obsolete pull_requests:
#250

[edx-requirements-bot]

List of packages in the PR without any issue.

• asgiref changes from 3.11.0 to 3.11.1
• astroid changes from 4.0.3 to 4.0.4
• coverage changes from 7.13.1 to 7.13.5
• dill changes from 0.4.0 to 0.4.1
• django changes from 5.2.10 to 5.2.12
• edx-opaque-keys changes from 3.0.0 to 3.1.0
• filelock changes from 3.20.3 to 3.25.2
• pip-tools changes from 7.5.2 to 7.5.3
• platformdirs changes from 4.5.1 to 4.9.4
• pylint changes from 4.0.4 to 4.0.5
• stevedore changes from 5.6.0 to 5.7.0
• tox changes from 4.34.1 to 4.50.1
• wheel changes from 0.45.1 to 0.46.3

[edx-requirements-bot]

These Packages need manual review..

• [MAJOR] cachetools changes from 6.2.4 to 7.0.5
• [REMOVED] chardet (5.2.0) removed from the requirements
• [MAJOR] isort changes from 7.0.0 to 8.0.1
• [MAJOR] packaging changes from 25.0 to 26.0
• [MAJOR] pip changes from 25.3 to 26.0.1
• [NEW] python-discovery (1.2.0) added to the requirements
• [MAJOR] pytz changes from 2025.2 to 2026.1.post1
• [MAJOR] setuptools changes from 80.9.0 to 82.0.1
• [NEW] tomli-w (1.2.0) added to the requirements
• [MAJOR] virtualenv changes from 20.36.1 to 21.2.0
• [MAJOR] web-fragments changes from 3.1.0 to 4.0.0