add more imports #10279

Job	Run time
Python 3.8 extended tests	2m 34s
test with unpublished langchain-core - Python 3.8	28s
Python 3.9 extended tests	2m 31s
test with unpublished langchain-core - Python 3.9	38s
Python 3.10 extended tests	2m 33s
test with unpublished langchain-core - Python 3.10	28s
Python 3.11 extended tests	2m 49s
test with unpublished langchain-core - Python 3.11	28s
lint / build (3.8)	31s
test / Python 3.8	35s
lint / build (3.11)	33s
test / Python 3.9	34s
test / Python 3.10	27s
test / Python 3.11	33s
compile-integration-tests / Python 3.8	28s
compile-integration-tests / Python 3.9	27s
compile-integration-tests / Python 3.10	27s
compile-integration-tests / Python 3.11	25s
pydantic-compatibility / Pydantic v1/v2 compatibility - Python 3.8	38s
pydantic-compatibility / Pydantic v1/v2 compatibility - Python 3.9	31s
pydantic-compatibility / Pydantic v1/v2 compatibility - Python 3.10	32s
pydantic-compatibility / Pydantic v1/v2 compatibility - Python 3.11	30s
	19m 40s

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