Bump to v1.5.1a4 #5028

Job	Run time
Dependency	4s
Shellcheck	3s
Prepare	50s
Ruff check and force	5s
Check commit	34s
Create pytest cache for Python 3.12	5s
Run pytest using Python 3.12	14s
Process test coverage	12s
Run mypy	11s
Process test complexity	10s
Build and publish Python 🐍 distributions 📦 to TestPyPI	20s
	2m 48s

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