Additional normalization of requirements #482

Job	Run time
Test with python 3.6 on windows-latest	1m 41s
Test with python 3.7 on windows-latest	1m 6s
Test with python 3.8 on windows-latest	10m 29s
Test with python 3.11 on windows-latest	10m 22s
Test with python 3.6 on macos-latest	59s
Test with python 3.7 on macos-latest	44s
Test with python 3.8 on macos-latest	4m 56s
Test with python 3.11 on macos-latest	4m 0s
Test with python 2.7 on ubuntu-20.04	31s
Test with python 3.6 on ubuntu-20.04	37s
Test with python 3.7 on ubuntu-latest	31s
Test with python 3.8 on ubuntu-latest	3m 54s
Test with python 3.9 on ubuntu-latest	3m 54s
Test with python 3.10 on ubuntu-latest	3m 43s
Test with python 3.11 on ubuntu-latest	3m 48s
	51m 15s

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