Add Python 3.15 typing updates #15169

Job	Run time
stubtest: stdlib (ubuntu-latest, 3.10)	37s
stubtest: stdlib (ubuntu-latest, 3.12)	38s
stubtest: stdlib (macos-latest, 3.12)	35s
stubtest: stdlib (macos-latest, 3.11)	25s
stubtest: stdlib (ubuntu-latest, 3.14)	31s
stubtest: stdlib (ubuntu-latest, 3.13)	39s
stubtest: stdlib (ubuntu-latest, 3.11)	39s
stubtest: stdlib (windows-latest, 3.12)	1m 29s
stubtest: stdlib (windows-latest, 3.13)	1m 11s
stubtest: stdlib (macos-latest, 3.14)	26s
stubtest: stdlib (macos-latest, 3.13)	23s
stubtest: stdlib (macos-latest, 3.10)	1m 1s
stubtest: stdlib (windows-latest, 3.15)	1m 43s
stubtest: stdlib (macos-latest, 3.15)	59s
stubtest: stdlib (windows-latest, 3.14)	1m 7s
stubtest: stdlib (ubuntu-latest, 3.15)	44s
stubtest: stdlib (windows-latest, 3.11)	2m 14s
	15m 21s

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