Bump to v1.6.3a0 test-version #5184

Job	Run time
Prepare	1m 3s
Shellcheck	6s
Dependency	6s
Ruff check and force	18s
Check commit	23s
Create pytest cache for Python ${{ matrix.python-version }}	0s
Run pytest using Python ${{ matrix.python-version }}	0s
Run mypy	0s
Process test coverage	0s
Process test complexity	0s
Build and publish Python 🐍 distributions 📦 to TestPyPI	0s
	1m 56s

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