Upgrade to LangChain v0.3 and Pydantic v2 #1201
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remove importliner from project initial upgrade to langchain~=0.3, pydantic~=2.0 default to `None` for all `Optional` fields explicitly fix history impl for Pydantic v2, fixes chat prefer `.model_dump_json()` over `.json()` Addresses a Pydantic v2 deprecation warning, as `BaseModel.json()` is now deprecated in favor of `BaseModel.model_dump_json()`. replace `.dict()` with `.model_dump()`. `BaseModel.dict()` is deprecated in favor of `BaseModel.model_dump()` in Pydantic v2. fix BaseProvider.server_settings fix OpenRouterProvider fix remaining unit tests address all Pydantic v1 deprecation warnings pre-commit fix mypy
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Description
Port of [2.x] Upgrade to LangChain v0.3 and Pydantic v2 #1199 to
mainbranch, tracking v3.Upgrades to LangChain v0.3 and Pydantic v2.
For more details, please see the thread in [2.x] Upgrade to LangChain v0.3 and Pydantic v2 #1199.