Remove requirements/test-djangoXY.txt

[cclauss]

Fixes #727

Concentrate testing state in just two files instead of lots of one-line files.

[Nusnus]

LGTM - do you want also to maybe rename the job on the way? @cclauss

[cclauss]

build is often used as a default job name in the GitHub Actions docs so I am OK with it.

If however, you want to suggest a different name, I have no objections.

[cclauss]

Thanks much as always!! I could use your help with getting a release published to PyPI (see Makefile).
Please see issue 680 for the history but I feel like this codebase is ready for a PyPI release that supports Dj5.0.

• https://github.com/celery/django-celery-beat/pulls?q=is%3Apr+author%3Acclauss+is%3Aclosed

[Nusnus]

Thanks much as always!! I could use your help with getting a release published to PyPI (see Makefile).
Please see issue 680 for the history but I feel like this codebase is ready for a PyPI release that supports Dj5.0.

• https://github.com/celery/django-celery-beat/pulls?q=is%3Apr+author%3Acclauss+is%3Aclosed

Let me see what I can do 🙏