[LangChain] Pin LangChain version to < 1.0.

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      Context

      We need to pin our LangChain dependencies to exclude 1.0, which introduced a host of breaking changes due to their major refactor. At the very least it seems that langchain.retrievers has moved to langchain_core.retrievers, causing build failures: https://github.com/langchain-ai/langchain-mongodb/actions/runs/18640071008/job/53137135394?pr=233

      Definition of done

      Pin langchain-mongodb to < 1.0 for langchain.

      Pitfalls

      None

            Assignee:
            Noah Stapp
            Reporter:
            Steve Silvester
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              Created:
              Updated:
              Resolved: