fix(deps): update dependency langgraph to v0.2.69

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
langgraph	0.2.67 -> 0.2.69

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Release Notes

langchain-ai/langgraph (langgraph)

v0.2.69

Compare Source

Changes since 0.2.68

• langgraph: release 0.2.69 (#​3256)
• Lint
• Guard and cache calls to find_subgraph_pregel
• docs: update README to include built w/ langgraph (#​3254)
• When using Command.PARENT also pass existing subgraph state to parent graph (#​3134)
• langgraph: add get_stream_writer() (#​3251)
• docs: small README update (#​3244)
• docs: update README (#​3242)
• langgraph: expose tags in the metadata for streamed message chunks (#​3238)
• docs: update streaming docstring for Pregel and expose in api ref (#​3229)
• Do not inject args in RunnableCallable if arg already exists (#​3185)

v0.2.68

Compare Source

Changes since 0.2.67

• langgraph: release 0.2.68 (#​3224)
• functional api: remove generator support (#​3220)
• langgraph: more unittests for functional API (#​3221)
• langgraph: actually fix flaky test (#​3219)
• langgraph: use 'prompt' param for model input preprocessing in create_react_agent (#​3173)
• langgraph: fix flaky test (#​3218)
• langgraph: handle task naming for reused class methods (#​3216)
• Fix type hints for entrypoint decorator (#​3198)
• langgraph: handle more callable types in tasks (#​3203)
• langgraph: add names for tasks (#​3202)
• Improve typings for task, it now returns a mixed sync/async future protocol (#​3186)
• Remove implementation of get_graph for @​entrypoint

create_react_agent changes

• state_modifier in create_react_agent has been renamed to prompt (both parameters are supported in a backwards-compatible manner):

create_react_agent(model, tools, prompt="You are a helpful assistant")

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