Enabled parallel tests #746

Job	Run time
Lint (black)	23s
Lint (ruff)	23s
Check for news fragments in 'changelog.d/'	10s
Lint (mypy)	31s
Test Python 3.10, Django 4.2, Redis.py latest	1m 49s
Test Python 3.10, Django 5.0, Redis.py latest	1m 45s
Test Python 3.10, Django 5.1, Redis.py latest	1m 53s
Test Python 3.11, Django 4.2, Redis.py latest	1m 58s
Test Python 3.11, Django 5.0, Redis.py latest	1m 53s
Test Python 3.11, Django 5.1, Redis.py latest	1m 43s
Test Python 3.12, Django 4.2, Redis.py latest	1m 54s
Test Python 3.12, Django 5.0, Redis.py latest	2m 16s
Test Python 3.12, Django 5.1, Redis.py latest	2m 6s
Test Python 3.8, Django 4.2, Redis.py latest	1m 56s
Test Python 3.9, Django 4.2, Redis.py latest	1m 54s
Test Python 3.12, Django 5.1, Redis.py master	1m 59s
Test Python 3.12, Django main, Redis.py latest	2m 7s
Test Python 3.12, Django main, Redis.py master	2m 6s
	28m 46s

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