chore: update markdown dependency to allow newer versions

[wgu-ram-chandra]

Fixes: #35271

Description

This PR addresses a compatibility issue with the markdown library in edx-platform. Starting from version 3.4.0, markdown introduced several breaking changes, including:

• Removal of the md_globals argument from extension hooks
• Replacement of .add() with .register() for processor registration
• Changes to the register() method's argument signature: now follows the format
  (<processor_instance>, <name>, <priority:int>)

These changes broke compatibility with dependencies such as openedx-django-wiki, which was still using the older Markdown API.

What’s Been Done

• Identified that the AnchorTagExtension class in openedx-django-wiki was not compatible with markdown>=3.4.0.
• Opened and merged a fix in the openedx-django-wiki repo: openedx/django-wiki#303
• That fix has been included in version 3.1.1 of the openedx-django-wiki package.
• With that update now available, this PR removes the markdown<3.4.0 constraint and allows markdown==3.8 (latest at time of writing), ensuring compatibility across both repos.

References

• Related PR in openedx-django-wiki: refactor: update markdown to 3.8 and adapt extension code for compatibility django-wiki#303
• Markdown 3.4.0 Release Notes: https://github.com/Python-Markdown/markdown/blob/3.4/docs/change\_log/release-3.4.md
• Markdown Source: https://github.com/Python-Markdown/markdown/tree/master/markdown

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[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.