Bump to v1.8.1 in pyproject.toml #5802

Job	Run time
Cache identify	15s
Shellcheck	6s
Dependency	6s
Prepare	1m 13s
Ruff check and force	19s
Check commit	30s
Run pytest using Python 3.13	40s
Run pytest using Python 3.14	25s
Run mypy	0s
Process test coverage	0s
Build and publish Python 🐍 distributions 📦 to TestPyPI	0s
Process test complexity	0s
	3m 34s

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