Fix bugs with Cypher validation #10304

Job	Run time
test with unpublished langchain-core - Python 3.8	30s
Python 3.8 extended tests	1m 1s
test with unpublished langchain-core - Python 3.9	38s
Python 3.9 extended tests	1m 2s
test with unpublished langchain-core - Python 3.10	35s
Python 3.10 extended tests	54s
Python 3.11 extended tests	2m 30s
test with unpublished langchain-core - Python 3.11	35s
compile-integration-tests / Python 3.8	31s
compile-integration-tests / Python 3.9	27s
compile-integration-tests / Python 3.10	28s
compile-integration-tests / Python 3.11	29s
lint / build (3.8)	29s
lint / build (3.11)	24s
pydantic-compatibility / Pydantic v1/v2 compatibility - Python 3.8	34s
test / Python 3.8	29s
pydantic-compatibility / Pydantic v1/v2 compatibility - Python 3.9	32s
pydantic-compatibility / Pydantic v1/v2 compatibility - Python 3.10	34s
test / Python 3.9	37s
pydantic-compatibility / Pydantic v1/v2 compatibility - Python 3.11	42s
test / Python 3.10	30s
test / Python 3.11	26s
	14m 57s

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