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.

• cachetools changes from 7.1.3 to 7.1.4
• certifi changes from 2026.4.22 to 2026.5.20
• click changes from 8.4.0 to 8.4.1
• coverage[toml] changes from 7.14.0 to 7.14.1
• diff-cover changes from 10.2.0 to 10.3.0
• distlib changes from 0.4.0 to 0.4.1
• django changes from 5.2.14 to 5.2.15
• filelock changes from 3.29.0 to 3.29.1
• greenlet changes from 3.5.0 to 3.5.1
• idna changes from 3.15 to 3.18
• lxml-html-clean changes from 0.4.4 to 0.4.5
• more-itertools changes from 11.0.2 to 11.1.0
• pip changes from 26.1.1 to 26.1.2
• platformdirs changes from 4.9.6 to 4.10.0
• pyproject-api changes from 1.10.0 to 1.10.1
• python-discovery changes from 1.3.1 to 1.4.0
• snowballstemmer changes from 3.0.1 to 3.1.1
• soupsieve changes from 2.8.3 to 2.8.4
• sqlalchemy changes from 2.0.49 to 2.0.50
• tox changes from 4.54.0 to 4.55.1
• virtualenv changes from 21.3.3 to 21.4.2