[Backport 1.5.latest] Drop support for Python 3.8 #2940

Job	Run time
build packages	15s
code-quality	1m 34s
unit test / python 3.9	52s
unit test / python 3.10	54s
unit test / python 3.11	1m 28s
verify packages / python 3.9 / ubuntu-latest	28s
verify packages / python 3.10 / ubuntu-latest	27s
verify packages / python 3.11 / ubuntu-latest	28s
verify packages / python 3.9 / macos-12	46s
verify packages / python 3.10 / macos-12	43s
verify packages / python 3.11 / macos-12	42s
verify packages / python 3.9 / windows-latest	1m 53s
verify packages / python 3.10 / windows-latest	1m 33s
verify packages / python 3.11 / windows-latest	1m 58s
	14m 1s

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