Update astral-sh/setup-uv action to v8 (#752) #2447

Job	Run time
flake8	9s
uv-check	8s
ruff-lint	13s
pymarkdown	11s
pre-commit / autofix-pre-commit	2m 7s
mypy (package)	18s
pytest	24s
mypy (tests)	23s
build-and-publish	44s
release	0s
	4m 37s

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