Update actions/setup-python action to v6 (#336) #2873

Job	Run time
Dependency	3s
Cache identify	4s
Shellcheck	5s
Prepare	12s
Ruff check and force	12s
Check commit	35s
Run pytest using Python 3.13	33s
Process test coverage	15s
Run mypy	0s
Process test complexity	8s
Build and publish Python 🐍 distributions 📦 to TestPyPI	11s
	2m 18s

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