Bump to v1.6.4a0 test-version #5252

Job	Run time
Shellcheck	6s
Dependency	4s
Prepare	55s
Ruff check and force	13s
Check commit	1m 37s
Create pytest cache for Python 3.13.0	15s
Create pytest cache for Python 3.12	6s
Run pytest using Python 3.13.0	27s
Run pytest using Python 3.12	14s
Process test coverage	25s
Run mypy	19s
Process test complexity	21s
Build and publish Python 🐍 distributions 📦 to TestPyPI	30s
	5m 32s

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