python: drop support for 3.8 #46

Job	Run time
linux-unit-tests (3.12, x64)	1m 2s
windows-functional-tests (3.12, x64, empty)	2m 22s
windows-unit-tests (3.9, x64)	2m 34s
windows-functional-tests (3.12, x64, nocloud)	4m 13s
windows-unit-tests (3.9, x86)	3m 30s
windows-functional-tests (3.12, x64, vmwareguest)	4m 13s
windows-unit-tests (3.12, x64)	1m 59s
windows-functional-tests (3.12, x86, empty)	2m 6s
windows-unit-tests (3.12, x86)	3m 23s
windows-functional-tests (3.12, x86, nocloud)	3m 3s
windows-functional-tests (3.12, x86, vmwareguest)	6m 30s
	34m 55s

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