[Backport 1.6.latest] Drop support for Python 3.8 #10987

Job	Run time
build packages	14s
code-quality	1m 12s
unit test / python 3.9	1m 0s
unit test / python 3.10	54s
unit test / python 3.11	1m 12s
verify packages / python 3.9 / ubuntu-latest	30s
verify packages / python 3.10 / ubuntu-latest	37s
verify packages / python 3.11 / ubuntu-latest	31s
verify packages / python 3.9 / macos-12	47s
verify packages / python 3.10 / macos-12	48s
verify packages / python 3.11 / macos-12	51s
verify packages / python 3.9 / windows-latest	1m 33s
verify packages / python 3.10 / windows-latest	2m 6s
verify packages / python 3.11 / windows-latest	1m 15s
	13m 30s

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