[stubsabot] Bump greenlet to 3.4.* (#15637) #14994

Job	Run time
stubtest: stdlib (windows-latest, 3.10)	1m 50s
stubtest: stdlib (ubuntu-latest, 3.12)	34s
stubtest: stdlib (ubuntu-latest, 3.10)	35s
stubtest: stdlib (ubuntu-latest, 3.13)	35s
stubtest: stdlib (windows-latest, 3.11)	1m 8s
stubtest: stdlib (macos-latest, 3.10)	1m 8s
stubtest: stdlib (windows-latest, 3.12)	1m 8s
stubtest: stdlib (ubuntu-latest, 3.14)	37s
stubtest: stdlib (macos-latest, 3.11)	29s
stubtest: stdlib (ubuntu-latest, 3.11)	38s
stubtest: stdlib (macos-latest, 3.14)	55s
stubtest: stdlib (macos-latest, 3.12)	27s
stubtest: stdlib (windows-latest, 3.13)	1m 32s
stubtest: stdlib (windows-latest, 3.14)	1m 49s
stubtest: stdlib (macos-latest, 3.13)	1m 1s
	14m 26s

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