Drop py38 #685

Job	Run time
Test with python 3.6 on windows-latest	2m 29s
Test with python 3.7 on windows-latest	1m 31s
Test with python 3.8 on windows-latest	1m 47s
Test with python 3.9 on windows-latest	11m 36s
Test with python 3.12 on windows-latest	12m 8s
Test with python 3.9 on macos-latest	3m 42s
Test with python 3.13 on macos-latest	3m 24s
Test with python 2.7 on ubuntu-20.04	33s
Test with python 3.6 on ubuntu-20.04	38s
Test with python 3.7 on ubuntu-22.04	36s
Test with python 3.8 on ubuntu-24.04	32s
Test with python 3.9 on ubuntu-24.04	4m 18s
Test with python 3.10 on ubuntu-24.04	4m 23s
Test with python 3.11 on ubuntu-24.04	4m 3s
Test with python 3.12 on ubuntu-24.04	4m 47s
Test with python 3.13 on ubuntu-24.04	4m 43s
	1h 1m 10s

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