Added support for Python 3.13 #733

Job	Run time
Check for news fragments in 'changelog.d/'	7s
Lint (black)	23s
Lint (ruff)	18s
Test Python 3.10, Django 4.2, Redis.py latest	4m 52s
Lint (mypy)	37s
Test Python 3.10, Django 5.0, Redis.py latest	5m 9s
Test Python 3.10, Django 5.1, Redis.py latest	5m 2s
Test Python 3.11, Django 4.2, Redis.py latest	4m 51s
Test Python 3.11, Django 5.0, Redis.py latest	5m 1s
Test Python 3.11, Django 5.1, Redis.py latest	4m 56s
Test Python 3.12, Django 4.2, Redis.py latest	5m 9s
Test Python 3.12, Django 5.0, Redis.py latest	4m 58s
Test Python 3.12, Django 5.1, Redis.py latest	5m 3s
Test Python 3.8, Django 4.2, Redis.py latest	4m 49s
Test Python 3.9, Django 4.2, Redis.py latest	4m 50s
Test Python 3.13, Django 5.1, Redis.py latest	5m 13s
Test Python 3.13, Django 5.1, Redis.py master	5m 17s
Test Python 3.13, Django main, Redis.py latest	5m 30s
Test Python 3.13, Django main, Redis.py master	5m 24s
	1h 17m 29s

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