drop python 3.8 #805

Job	Run time
Full tests on ubuntu-latest with Python 3.9	1m 7s
Full tests on windows-latest with Python 3.9	1m 45s
Full tests on macos-latest with Python 3.9	1m 9s
assess-file-changes / Test changed-files	4s
Full tests on macos-13 with Python 3.9	1m 33s
Full tests on ubuntu-latest with Python 3.10	1m 7s
Full tests on windows-latest with Python 3.10	2m 49s
Full tests on macos-latest with Python 3.10	1m 6s
Full tests on macos-13 with Python 3.10	1m 48s
Full tests on ubuntu-latest with Python 3.11	1m 9s
Full tests on windows-latest with Python 3.11	2m 6s
Full tests on macos-latest with Python 3.11	51s
Full tests on macos-13 with Python 3.11	1m 32s
Full tests on ubuntu-latest with Python 3.12	1m 11s
Full tests on windows-latest with Python 3.12	2m 18s
Full tests on macos-latest with Python 3.12	1m 4s
Full tests on macos-13 with Python 3.12	1m 48s
Auto-detecting CHANGELOG.md updates	1s
	24m 28s

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