Unpin Python 3.13 and 3.14 #14977

Job	Run time
stubtest: stdlib (windows-latest, 3.14)	1m 0s
stubtest: stdlib (windows-latest, 3.10)	1m 7s
stubtest: stdlib (macos-latest, 3.14)	46s
stubtest: stdlib (macos-latest, 3.12)	38s
stubtest: stdlib (ubuntu-latest, 3.14)	41s
stubtest: stdlib (ubuntu-latest, 3.11)	36s
stubtest: stdlib (ubuntu-latest, 3.12)	33s
stubtest: stdlib (ubuntu-latest, 3.13)	38s
stubtest: stdlib (windows-latest, 3.12)	1m 3s
stubtest: stdlib (ubuntu-latest, 3.10)	42s
stubtest: stdlib (macos-latest, 3.10)	48s
stubtest: stdlib (macos-latest, 3.11)	40s
stubtest: stdlib (windows-latest, 3.11)	1m 3s
stubtest: stdlib (windows-latest, 3.13)	1m 3s
stubtest: stdlib (macos-latest, 3.13)	46s
	12m 4s

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