update CheckConstraint to use condition kwarg over check

[eviljeff]

One of the items from mozilla/addons#16012

Description

CheckConstraint's check arg is deprecated in favour of a condition kwarg.

Context

It apparently will be removed in django6.0, so this is to get ahead of that deprecation, and to silence some of the warnings that clutter up logging

Testing

n/a

Checklist

• Add #ISSUENUM at the top of your PR to an existing open issue in the mozilla/addons repository.
• Successfully verified the change locally.
• The change is covered by automated tests, or otherwise indicated why doing so is unnecessary/impossible.
• Add before and after screenshots (Only for changes that impact the UI).
• Add or update relevant docs reflecting the changes made.