Make uv an optional dependency again #664

Job	Run time
Test with python 3.6 on windows-latest	1m 37s
Test with python 3.7 on windows-latest	1m 26s
Test with python 3.8 on windows-latest	3m 3s
Test with python 3.12 on windows-latest	3m 2s
Test with python 3.8 on macos-latest	3m 14s
Test with python 3.12 on macos-latest	2m 56s
Test with python 2.7 on ubuntu-20.04	35s
Test with python 3.6 on ubuntu-20.04	41s
Test with python 3.7 on ubuntu-latest	36s
Test with python 3.8 on ubuntu-latest	3m 10s
Test with python 3.9 on ubuntu-latest	3m 10s
Test with python 3.10 on ubuntu-latest	3m 11s
Test with python 3.11 on ubuntu-latest	3m 12s
Test with python 3.12 on ubuntu-latest	3m 11s
	33m 4s

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