Add Python 3.15 typing updates #15171

Job	Run time
stubtest: stdlib (ubuntu-latest, 3.14)	47s
stubtest: stdlib (ubuntu-latest, 3.11)	41s
stubtest: stdlib (windows-latest, 3.11)	1m 37s
stubtest: stdlib (ubuntu-latest, 3.12)	36s
stubtest: stdlib (ubuntu-latest, 3.10)	39s
stubtest: stdlib (windows-latest, 3.12)	1m 17s
stubtest: stdlib (macos-latest, 3.10)	1m 2s
stubtest: stdlib (ubuntu-latest, 3.13)	39s
stubtest: stdlib (ubuntu-latest, 3.15)	45s
stubtest: stdlib (windows-latest, 3.15)	1m 36s
stubtest: stdlib (windows-latest, 3.13)	1m 6s
stubtest: stdlib (macos-latest, 3.15)	53s
stubtest: stdlib (macos-latest, 3.12)	32s
stubtest: stdlib (windows-latest, 3.14)	1m 51s
stubtest: stdlib (macos-latest, 3.14)	23s
stubtest: stdlib (macos-latest, 3.13)	34s
stubtest: stdlib (macos-latest, 3.11)	34s
	15m 32s

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