Bump to a3 for testpypi update #2578

Job	Run time
Dependency	3s
Shellcheck	4s
Cache identify	5s
Prepare	1m 16s
Ruff check and force	7s
Check commit	34s
Run pytest using Python 3.13	1m 33s
Process test coverage	21s
Run mypy	-1s
Process test complexity	10s
Build and publish Python 🐍 distributions 📦 to TestPyPI	12s
	4m 24s

Provide feedback