Save cache at suitable moments. #2811

Job	Run time
Shellcheck	6s
Cache identify	6s
Dependency	4s
Prepare	7s
Ruff check and force	7s
Run pytest using Python ${{ matrix.python-version }}	0s
Process test coverage	0s
Check commit	0s
Run mypy	0s
Build and publish Python 🐍 distributions 📦 to TestPyPI	0s
Process test complexity	0s
	30s

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