Bump to v1.7.3a3 #5473

Job	Run time
Dependency	4s
Prepare	55s
Shellcheck	3s
Ruff check and force	19s
Check commit	44s
Create pytest cache for Python 3.13.0	17s
Create pytest cache for Python 3.12	6s
Run pytest using Python 3.13.0	26s
Run pytest using Python 3.12	12s
Process test coverage	17s
Run mypy	24s
Process test complexity	18s
Build and publish Python 🐍 distributions 📦 to TestPyPI	30s
	4m 35s

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