remove EOLed python 3.8 support #559

Job	Run time
Test on python 3.9 and ubuntu-latest	1m 46s
Test on python 3.9 and windows-latest	5m 12s
Test on python 3.9 and macos-latest	14s
Test on python 3.10 and ubuntu-latest	1m 51s
Test on python 3.10 and windows-latest	4m 9s
Test on python 3.10 and macos-latest	15s
Test on python 3.11 and ubuntu-latest	1m 29s
Test on python 3.11 and windows-latest	5m 39s
Test on python 3.11 and macos-latest	17s
Test on python 3.12 and ubuntu-latest	1m 38s
Test on python 3.12 and windows-latest	5m 37s
Test on python 3.12 and macos-latest	14s
Test on python 3.13 and ubuntu-latest	1m 54s
Test on python 3.13 and windows-latest	5m 38s
Test on python 3.13 and macos-latest	20s
	36m 13s

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