chore: Upgrade Python requirements

[edx-requirements-bot]

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

Deleted obsolete pull_requests:
#308

[edx-requirements-bot]

List of packages in the PR without any issue.

• certifi changes from 2025.4.26 to 2025.6.15
• click changes from 8.2.0 to 8.2.1
• coverage[toml] changes from 7.8.0 to 7.9.1
• django changes from 4.2.21 to 4.2.23
• markdown changes from 3.8 to 3.8.2
• pluggy changes from 1.5.0 to 1.6.0
• pygments changes from 2.19.1 to 2.19.2
• pytest changes from 8.3.5 to 8.4.1
• pytest-cov changes from 6.1.1 to 6.2.1
• requests changes from 2.32.3 to 2.32.4
• setuptools changes from 80.4.0 to 80.9.0
• tox changes from 4.25.0 to 4.27.0
• typing-extensions changes from 4.13.2 to 4.14.0

[edx-requirements-bot]

These Packages need manual review..

• [MAJOR] cachetools changes from 5.5.2 to 6.1.0
• [NEW] pygments (2.19.2) added to the requirements

[edx-requirements-bot]

Closing obsolete PR.