Bump to a28 for testing #961

Job	Run time
Prepare	1m 18s
Dependency	2s
Shellcheck	5s
Ruff check and force	6s
Check commit	39s
Create pytest cache for Python 3.12	30s
Create pytest cache for Python 3.11	32s
Run pytest using Python 3.12	22s
Run pytest using Python 3.11	19s
Process test coverage	10s
Run mypy	5s
Process test complexity	5s
Build and publish Python 🐍 distributions 📦 to TestPyPI	25s
	4m 38s

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