Bump to b3 for testing #1791

Job	Run time
Prepare	1m 12s
Shellcheck	4s
Dependency	5s
Ruff check and force	5s
Check commit	42s
Create pytest cache for Python 3.13	33s
Run pytest using Python 3.13	20s
Process test coverage	12s
Run mypy	6s
Build and publish Python 🐍 distributions 📦 to TestPyPI	31s
Process test complexity	7s
	3m 57s

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