Enabled parallel tests #748

Job	Run time
Lint (black)	40s
Test Python 3.10, Django 4.2, Redis.py latest	1m 42s
Lint (ruff)	24s
Check for news fragments in 'changelog.d/'	13s
Test Python 3.10, Django 5.0, Redis.py latest	1m 41s
Lint (mypy)	31s
Test Python 3.10, Django 5.1, Redis.py latest	1m 38s
Test Python 3.11, Django 4.2, Redis.py latest	1m 45s
Test Python 3.11, Django 5.0, Redis.py latest	1m 54s
Test Python 3.11, Django 5.1, Redis.py latest	1m 45s
Test Python 3.12, Django 4.2, Redis.py latest	1m 49s
Test Python 3.12, Django 5.0, Redis.py latest	1m 44s
Test Python 3.12, Django 5.1, Redis.py latest	1m 43s
Test Python 3.8, Django 4.2, Redis.py latest	2m 13s
Test Python 3.9, Django 4.2, Redis.py latest	1m 39s
Test Python 3.12, Django 5.1, Redis.py master	1m 50s
Test Python 3.12, Django main, Redis.py latest	1m 54s
Test Python 3.12, Django main, Redis.py master	1m 47s
	26m 52s

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