chore(deps): update dependency django-celery-beat to v2.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-celery-beat	==2.5.0 -> ==2.6.0

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Release Notes

celery/django-celery-beat (django-celery-beat)

v2.6.0

Compare Source

=====
:release-date: 2024-03-03
:release-by: Christian Clauss

• Avoid crash when can not get human readable description (#​648).
• Update codeql-analysis.yml (#​653).
• Fix CI: Change assert self.app.timezone.zone to assert self.app.timezone.key (#​664).
• Drop Django 4.0 from CI to avoid security issues (#​662).
• Fix Issue #​388: Celery Beat scheduled tasks may be executed repeatedly (#​660).
• Update README.rst (#​670).
• Update runtime.txt to include Django 5.0 (#​681).
• Replace case.patching fixture with mockeypatch + MagicMock (#​692).
• Update README.rst - Crontab effect description (#​689).
• Update supported Python & Django version in setup.py (#​672).
• Add Python 3.12 to test matrix and add classifier (#​690).
• Django v5.0: django.utils.timezone.utc alias --> datetime.timezone.utc (#​703).
• Upgrade GitHub Actions and PyPy 3.10 and Django 5.0 (#​699).
• Testing Django v5.0 on pypy-3.10-v7.3.14 passes (#​705).
• Prepare for release v2.6.0 to support Py3.12 and Dj5.0 (#​712).
• GitHub Actions: Do not hardcode an out-of-date version of PyPy (#​715).
• Use the same order in the admin as in the cron schedule expression (#​716).
• Upgrade pip and GitHub Actions dependencies with dependabot (#​721).
• Bump github/codeql-action from 2 to 3 (#​722).
• Bump actions/checkout from 3 to 4 (#​723).
• Update pytest requirement from <8.0,>=6.2.5 to >=6.2.5,<9.0 (#​724).
• Remove requirements/test-djangoXY.txt (#​728).
• Remove code for unsupported django.VERSION < (3, 2) (#​729).
• Added sphinxcontrib-django to extensions (#​736).

.. _version-2.5.0:

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