Prepare 2.1 #559

Job	Run time
Test with python 3.6 on windows-latest	1m 37s
Test with python 3.7 on windows-latest	1m 7s
Test with python 3.8 on windows-latest	8m 0s
Test with python 3.12 on windows-latest	8m 35s
Test with python 3.6 on macos-latest	1m 30s
Test with python 3.7 on macos-latest	52s
Test with python 3.8 on macos-latest	4m 16s
Test with python 3.12 on macos-latest	9m 11s
Test with python 2.7 on ubuntu-20.04	30s
Test with python 3.6 on ubuntu-20.04	40s
Test with python 3.7 on ubuntu-latest	28s
Test with python 3.8 on ubuntu-latest	3m 29s
Test with python 3.9 on ubuntu-latest	3m 29s
Test with python 3.10 on ubuntu-latest	3m 30s
Test with python 3.11 on ubuntu-latest	3m 13s
Test with python 3.12 on ubuntu-latest	5m 17s
	55m 44s

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