Update actions/setup-python action to v6 (#786) #5720

Job	Run time
Cache identify	5s
Shellcheck	4s
Dependency	6s
Prepare	16s
Ruff check and force	16s
Check commit	39s
Run pytest using Python 3.13	33s
Run mypy	31s
Process test coverage	20s
Build and publish Python 🐍 distributions 📦 to TestPyPI	9s
Process test complexity	17s
	3m 16s

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