[Backport 1.8.latest] Drop support for Python 3.8 #2937

Job	Run time
code-quality	1m 30s
build packages	17s
unit test / python 3.9	1m 2s
unit test / python 3.10	1m 15s
unit test / python 3.11	1m 8s
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	35s
verify packages / python 3.10 / macos-12	34s
verify packages / python 3.11 / macos-12	50s
verify packages / python 3.9 / windows-latest	1m 11s
verify packages / python 3.10 / windows-latest	1m 12s
verify packages / python 3.11 / windows-latest	1m 9s
	12m 6s

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