Extend internal-use selfs #5116

Job	Run time
Prepare	59s
Shellcheck	3s
Dependency	8s
Ruff check and force	5s
Check commit	29s
Create pytest cache for Python 3.12	11s
Run pytest using Python 3.12	14s
Process test coverage	22s
Run mypy	13s
Process test complexity	10s
Build and publish Python 🐍 distributions 📦 to TestPyPI	24s
	3m 18s

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