Update astral-sh/setup-uv action to v8.1.0 #2449

Job	Run time
ruff-lint	8s
pymarkdown	9s
flake8	10s
uv-check	10s
pre-commit / autofix-pre-commit	2m 16s
pytest	25s
mypy (package)	13s
mypy (tests)	15s
build-and-publish	57s
release	-1s
	4m 42s

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