Enabled parallel tests #739

Job	Run time
Lint (black)	33s
Lint (ruff)	18s
Check for news fragments in 'changelog.d/'	6s
Test Python 3.10, Django 4.2, Redis.py latest	1m 13s
Lint (mypy)	24s
Test Python 3.10, Django 5.0, Redis.py latest	1m 15s
Test Python 3.10, Django 5.1, Redis.py latest	1m 6s
Test Python 3.11, Django 4.2, Redis.py latest	57s
Test Python 3.11, Django 5.0, Redis.py latest	53s
Test Python 3.11, Django 5.1, Redis.py latest	1m 18s
Test Python 3.12, Django 4.2, Redis.py latest	1m 23s
Test Python 3.12, Django 5.0, Redis.py latest	1m 7s
Test Python 3.12, Django 5.1, Redis.py latest	1m 17s
Test Python 3.8, Django 4.2, Redis.py latest	58s
Test Python 3.9, Django 4.2, Redis.py latest	52s
Test Python 3.12, Django 5.1, Redis.py master	1m 11s
Test Python 3.12, Django main, Redis.py latest	1m 4s
Test Python 3.12, Django main, Redis.py master	1m 7s
	17m 2s

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