Remove all POSIX related suggestions #2945

Job	Run time
Cache identify	4s
Dependency	4s
Shellcheck	5s
Prepare	7s
Ruff check and force	9s
Check commit	29s
Run pytest using Python 3.13	30s
Process test coverage	11s
Run mypy	0s
Build and publish Python 🐍 distributions 📦 to TestPyPI	8s
Process test complexity	11s
	1m 58s

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