docs: Deprecating message for problem-builder (#420)

This change adds a message deprecating problem builder.

Announcement on forums: https://discuss.openedx.org/t/deprecation-removal-problem-builder-repository/13664
DEPR Ticket: openedx/public-engineering#268

Merge pull request #458 from Faraz32123/fix/parse_xml_error_during_im…

…port

fix: parse_xml error during import

feat: add support for Django 4.2

fix: do not use the `runtime.replace_urls` when the runtime is not ready

This happens while generating the Block Structures.

fix: include static files in Python package

build: fix description content type

feat: add support for celery 5.x (#334)

* feat: add support for celery 5.x
* chore: bump version for release

Merge pull request #333 from open-craft/mtyaka/FAL-2198-django3.2

[FAL-2198] Django 3.2 support

fix: handle deleted questions (#328)

Step builder was raising `ValueError` if a question was deleted by the course author.

MCKIN-12600 key error on filtering username (#326)