Drop support for Python 3.8 #7399

Job	Run time
build packages	15s
code-quality	1m 5s
unit test / python 3.9	50s
unit test / python 3.10	48s
unit test / python 3.11	48s
unit test / python 3.12	1m 2s
verify packages / python 3.9 / ubuntu-22.04	39s
verify packages / python 3.10 / ubuntu-22.04	36s
verify packages / python 3.11 / ubuntu-22.04	35s
verify packages / python 3.12 / ubuntu-22.04	39s
verify packages / python 3.9 / macos-12	1m 11s
verify packages / python 3.10 / macos-12	1m 15s
verify packages / python 3.11 / macos-12	56s
verify packages / python 3.12 / macos-12	1m 14s
verify packages / python 3.9 / windows-2022	1m 37s
verify packages / python 3.10 / windows-2022	1m 46s
verify packages / python 3.11 / windows-2022	2m 39s
verify packages / python 3.12 / windows-2022	1m 43s
	19m 38s

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