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.

• coverage[toml] changes from 7.13.5 to 7.14.0
• django changes from 5.2.13 to 5.2.14
• django-stubs changes from 6.0.3 to 6.0.4
• django-stubs-ext changes from 6.0.3 to 6.0.4
• idna changes from 3.13 to 3.14
• librt changes from 0.9.0 to 0.11.0
• markdown-it-py changes from 4.0.0 to 4.2.0
• pip changes from 26.1 to 26.1.1
• python-discovery changes from 1.2.2 to 1.3.0
• tomlkit changes from 0.14.0 to 0.15.0
• types-pyyaml changes from 6.0.12.20260408 to 6.0.12.20260510
• urllib3 changes from 2.6.3 to 2.7.0
• virtualenv changes from 21.3.0 to 21.3.1

[edx-requirements-bot]

These Packages need manual review..

• [NEW] ast-serialize (0.3.0) added to the requirements
• [MAJOR] cryptography changes from 47.0.0 to 48.0.0
• [MAJOR] mypy changes from 1.20.2 to 2.0.0