Update codecov/codecov-action action to v7 #6217

Job	Run time
Dependency	4s
Cache identify	7s
Shellcheck	5s
Prepare	6s
Ruff check and force	6s
Check commit	19s
Run pytest using Python 3.14	21s
Run pytest using Python 3.13	15s
Run mypy	12s
Process test coverage	14s
Build and publish Python 🐍 distributions 📦 to TestPyPI	9s
Process test complexity	7s
	2m 5s

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