Extend internal-use selfs #5114

Job	Run time
Prepare	48s
Dependency	5s
Shellcheck	3s
Ruff check and force	10s
Check commit	28s
Create pytest cache for Python 3.12	9s
Run pytest using Python 3.12	15s
Process test coverage	0s
Run mypy	0s
Process test complexity	0s
Build and publish Python 🐍 distributions 📦 to TestPyPI	0s
	1m 58s

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