langchain-core==0.2.39

Changes since langchain-core==0.2.38

core[patch]: Release 0.2.39 (#26279)
core[minor]: Remove serialized manifest from tracing requests for non-llm runs (#26270)
core[patch]: wrap mermaid node names w/ markdown in

tag (#26235)
core[patch]: fix edge labels for mermaid graphs (#26201)
infra: Clear cache for env-var checks (#26073)
fmt
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