Bump astral-sh/setup-uv from 6.6.1 to 6.8.0 in the actions group #2430

Job	Run time
Run tests (3.10)	14s
Run tests (3.13.0)	25s
Run tests (3.9.12)	20s
Run tests (3.11)	19s
Run tests (3.12)	19s
Run tests (3.10.4)	23s
Run tests (3.11.0)	20s
Run tests (pypy3.11)	20s
Run tests (pypy3.9)	26s
Run tests (pypy3.10)	22s
Run tests (3.13)	17s
Run tests (3.9)	17s
Run tests (3.14)	22s
Run tests (3.12.0)	24s
Create an issue if daily tests failed	0s
	4m 48s

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