Bump to a9 #2342

Job	Run time
Cache identify	5s
Shellcheck	4s
Dependency	3s
Prepare	1m 10s
Ruff check and force	9s
Check commit	31s
Run pytest using Python 3.13	1m 35s
Process test coverage	14s
Run mypy	0s
Build and publish Python 🐍 distributions 📦 to TestPyPI	22s
Process test complexity	8s
	4m 21s

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