Enabled parallel tests #747

Job	Run time
Lint (black)	34s
Lint (ruff)	32s
Check for news fragments in 'changelog.d/'	5s
Test Python 3.10, Django 4.2, Redis.py latest	1m 41s
Lint (mypy)	31s
Test Python 3.10, Django 5.0, Redis.py latest	1m 39s
Test Python 3.10, Django 5.1, Redis.py latest	1m 50s
Test Python 3.11, Django 4.2, Redis.py latest	1m 40s
Test Python 3.11, Django 5.0, Redis.py latest	1m 46s
Test Python 3.11, Django 5.1, Redis.py latest	1m 54s
Test Python 3.12, Django 4.2, Redis.py latest	1m 44s
Test Python 3.12, Django 5.0, Redis.py latest	1m 50s
Test Python 3.12, Django 5.1, Redis.py latest	1m 50s
Test Python 3.8, Django 4.2, Redis.py latest	2m 23s
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 41s
Test Python 3.12, Django main, Redis.py master	1m 56s
	27m 5s

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