[Backport 1.6.latest] Drop support for Python 3.8 #2939

Job	Run time
code-quality	1m 42s
unit test / python 3.9	1m 18s
unit test / python 3.10	53s
unit test / python 3.11	50s
build packages	14s
verify packages / python 3.9 / ubuntu-latest	31s
verify packages / python 3.10 / ubuntu-latest	29s
verify packages / python 3.11 / ubuntu-latest	27s
verify packages / python 3.9 / macos-12	42s
verify packages / python 3.10 / macos-12	48s
verify packages / python 3.11 / macos-12	41s
verify packages / python 3.9 / windows-latest	1m 4s
verify packages / python 3.10 / windows-latest	1m 48s
verify packages / python 3.11 / windows-latest	1m 28s
	12m 55s

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