Update actions/checkout action to v6.0.2 (#396) #3154

Job	Run time
Cache identify	7s
Shellcheck	4s
Dependency	4s
Prepare	7s
Ruff check and force	8s
Check commit	29s
Run pytest using Python 3.14	27s
Run pytest using Python 3.13	35s
Process test coverage	17s
Run mypy	-1s
Build and publish Python 🐍 distributions 📦 to TestPyPI	11s
Process test complexity	12s
	2m 40s

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