[Backport 1.4.latest] Drop support for Python 3.8 #10989

Job	Run time
build packages	18s
code-quality	1m 21s
unit test / python 3.9	1m 5s
unit test / python 3.10	51s
unit test / python 3.11	56s
verify packages / python 3.9 / ubuntu-latest	34s
verify packages / python 3.10 / ubuntu-latest	33s
verify packages / python 3.11 / ubuntu-latest	35s
verify packages / python 3.9 / macos-12	52s
verify packages / python 3.10 / macos-12	51s
verify packages / python 3.11 / macos-12	56s
verify packages / python 3.9 / windows-latest	1m 30s
verify packages / python 3.10 / windows-latest	1m 38s
verify packages / python 3.11 / windows-latest	1m 55s
	13m 55s

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