[Backport 1.7.latest] Drop support for Python 3.8 #7433

Job	Run time
code-quality	1m 2s
build packages	15s
unit test / python 3.9	59s
unit test / python 3.10	47s
unit test / python 3.11	44s
verify packages / python 3.9 / ubuntu-22.04	42s
verify packages / python 3.10 / ubuntu-22.04	36s
verify packages / python 3.11 / ubuntu-22.04	35s
verify packages / python 3.9 / macos-12	57s
verify packages / python 3.10 / macos-12	1m 3s
verify packages / python 3.11 / macos-12	53s
verify packages / python 3.9 / windows-2022	2m 12s
verify packages / python 3.10 / windows-2022	2m 2s
verify packages / python 3.11 / windows-2022	2m 24s
	15m 11s

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