Update astral-sh/setup-uv action to v8.1.0 (#753) #2450

Job	Run time
flake8	9s
pymarkdown	8s
ruff-lint	10s
uv-check	7s
pre-commit / autofix-pre-commit	3m 10s
pytest	20s
mypy (package)	14s
mypy (tests)	23s
build-and-publish	1m 33s
release	0s
	6m 14s

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