* refactor: Remove PyContracts usage.

We have not used PyContracts in a while and it is overhead we don't
need in edx-platform.

https://openedx.atlassian.net/browse/DEPR-147



* chore: Updating Python Requirements (#28018)

Co-authored-by: edX requirements bot <49161187+edx-requirements-bot@users.noreply.github.com>