build(deps): Bump langchain-core from 1.5.6 to 1.6.1

[dependabot]

Bumps langchain-core from 1.5.6 to 1.6.1.

Release notes

Sourced from langchain-core's releases.

langchain-core==1.6.1

Changes since langchain-core==1.6.0

revert: release(core): 1.6.2 (#39971) release(core): 1.6.2 (#39967) fix(core): shore up indexing in genai v1 streaming content (#39964) fix(core): make StructuredTool JSON-serializable (#39631) chore(deps): bump minor and patch dependencies (#39869) release(core): 1.6.1 (#39832) feat(core): propagate gateway information on error path (#39829)

langchain-core==1.6.0

Changes since langchain-core==1.5.6

release(core): 1.6.0 (#39760) fix(core): resolve postponed annotations in StructuredTool._injected_args_keys (#39602) feat(core): add standard model exception types (#39538) fix(core): allow deserializing RunnablePick (#39753) fix(core): make convert_to_openai_function handle callables and non-dict mappings (#39750) fix(core): make subprocess and temporary file tests portable on Windows (#39664) fix(core): fail fast when tool schemas can't resolve forward refs during serialization (#39570) test(core): avoid version-dependent runnable snapshots (#39705) fix(core): require all nested properties for strict tool schemas (#39306) fix(core): remove stale sync-stream xfail [closes #39720] (#39723) perf(core): Lazily import transformers (#38037) fix(core): accept non-dict Mapping values in mustache templates (#39680) docs(core): clarify Runnable pipe coercion [closes #39075] (#39707) fix(core): finalize chain-group runs on BaseException (#39699)

Commits

• 4fe9d30 chore(openai): fix tests (#39972)
• 8fa38dc revert: release(core): 1.6.2 (#39971)
• 122030d release(core): 1.6.2 (#39967)
• 7d4b42b release(langchain): 1.3.18 (#39966)
• 4a66e35 fix(langchain): preserve content-block shape in PIIMiddleware redaction (#39894)
• 38e2113 fix(core): shore up indexing in genai v1 streaming content (#39964)
• 13b1b2f fix(core): make StructuredTool JSON-serializable (#39631)
• 3b3b308 release(anthropic): 1.7.0 (#39963)
• e3f6adf feat(anthropic): support top-level param for skills via container; `updates...
• c253f54 fix(openai): correct reasoning_effort_levels for gpt-5 and gpt-5.1 profiles...
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