Bump actions/setup-python from 4 to 5 #539

Job	Run time
Lint (black)	26s
Check for news fragments in 'changelog.d/'	11s
Lint (ruff)	23s
Test Python 3.8, Django 4.1, Redis.py latest	5m 6s
Lint (mypy)	32s
Test Python 3.8, Django 4.2, Redis.py latest	4m 58s
Test Python 3.9, Django 4.1, Redis.py latest	4m 59s
Test Python 3.9, Django 4.2, Redis.py latest	4m 57s
Test Python 3.10, Django 4.1, Redis.py latest	4m 57s
Test Python 3.10, Django 4.2, Redis.py latest	4m 56s
Test Python 3.11, Django 4.1, Redis.py latest	4m 58s
Test Python 3.11, Django 4.2, Redis.py latest	4m 59s
Test Python 3.11, Django 4.2, Redis.py master	4m 57s
Test Python 3.11, Django main, Redis.py latest	5m 8s
Test Python 3.11, Django main, Redis.py master	5m 7s
	56m 34s

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