python: add support for 3.14 only #92

Job	Run time
windows-functional-tests (3.14, x86, nocloud)	5m 12s
windows-functional-tests (3.14, x64, empty)	2m 15s
windows-functional-tests (3.14, x86, vmwareguest)	4m 24s
linux-unit-tests (3.14, x64)	57s
windows-functional-tests (3.14, x64, nocloud)	3m 33s
windows-unit-tests (3.14, x64)	2m 24s
windows-functional-tests (3.14, x86, empty)	3m 50s
windows-functional-tests (3.14, x64, vmwareguest)	3m 13s
	25m 48s

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