Polymorphic test issue

[JacobCoffee]

Description

Hi, I've recently been onboarding to the Python.org repository and have upgraded the service from Django 2 to Django 4.2 - as such I'm relatively green to some of the dependencies used.

Unfortunately during some dependency upgrade it seems a test has become intermittently flaky (python/pythondotorg#2567)

DETAIL:  Key (polymorphic_ctype_id)=(100) is not present in table "django_content_type".

Sorry for the issue, I would prefer this be a discussion as I am just looking for a set of eyes or some guidance on how I can track down the cause of this flakiness during Github Actions CI (I have yet to reproduce it locally after many local test runs)

Any advice is much appreciated :) Feel free to close if this is not the right place to discuss such things.