Make uv an optional dependency again #665

Job	Run time
Test with python 3.6 on windows-latest	1m 52s
Test with python 3.7 on windows-latest	1m 23s
Test with python 3.8 on windows-latest	12m 36s
Test with python 3.12 on windows-latest	11m 45s
Test with python 3.8 on macos-latest	3m 25s
Test with python 3.12 on macos-latest	3m 16s
Test with python 2.7 on ubuntu-20.04	35s
Test with python 3.6 on ubuntu-20.04	44s
Test with python 3.7 on ubuntu-latest	33s
Test with python 3.8 on ubuntu-latest	4m 1s
Test with python 3.9 on ubuntu-latest	4m 14s
Test with python 3.10 on ubuntu-latest	4m 25s
Test with python 3.11 on ubuntu-latest	4m 10s
Test with python 3.12 on ubuntu-latest	5m 24s
	58m 23s

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