Fix flaky LangGraph timeout tests #4998

Job	Run time
test-latest-deps	9m 36s
check-protos	7m 45s
cloud-test	1m 51s
features-tests / test	7m 15s
build-lint-test (3.10, macos-arm)	12m 24s
build-lint-test (3.10, ubuntu-latest)	13m 33s
build-lint-test (3.14, windows-latest)	28m 21s
build-lint-test (3.10, windows-latest)	19m 49s
build-lint-test (3.10, ubuntu-arm)	10m 58s
build-lint-test (3.14, ubuntu-latest)	17m 29s
build-lint-test (3.14, macos-arm)	9m 13s
build-lint-test (3.14, macos-intel)	18m 15s
build-lint-test (3.14, ubuntu-arm)	11m 31s
build-lint-test (3.10, macos-intel)	29m 56s
	3h 17m 56s

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