chore(deps): bump the langchain group across 1 directory with 3 updates

[dependabot]

Bumps the langchain group with 2 updates in the /src/backend directory: langchain and langchain-google-genai.

Updates langchain from 1.3.16 to 1.3.18

Release notes

Sourced from langchain's releases.

langchain==1.3.18

Changes since langchain==1.3.17

release(langchain): 1.3.18 (#39966) fix(langchain): preserve content-block shape in PIIMiddleware redaction (#39894) fix(core): shore up indexing in genai v1 streaming content (#39964)

langchain==1.3.17

Changes since langchain==1.3.16

release(langchain): 1.3.17 (#39893) fix(langchain): frame custom HITL rejection reasons (#39773) chore(deps): bump minor and patch dependencies (#39869)

Commits

• 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...
• 513e425 chore(model-profiles): refresh model profile data (#39954)
• fd2fbd7 feat(anthropic): support 1.0 sdk (#39938)
• b0fb33f fix(perplexity): map Responses API cache tokens into input_token_details (#39...
• Additional commits viewable in compare view

Updates langchain-google-genai from 4.3.5 to 4.3.7

Release notes

Sourced from langchain-google-genai's releases.

langchain-google-genai==4.3.7

Changes since libs/genai/v4.3.6

release(genai): 4.3.7 (#1977) fix(genai): apply distinct indexes to repeated block types (#1974) chore: bump types-google-cloud-ndb from 2.4.0.20260518 to 2.4.0.20260724 in /libs/genai (#1917) chore: bump the minor-and-patch group across 1 directory with 6 updates (#1969) fix(genai): remove __del__ that closes a potentially shared client (#1963) fix(genai): send skip_thought_signature_validator as a literal string (#1972) test(genai): failing test for DUMMY_THOUGHT_SIGNATURE rejection (#1971) fix(genai): drop foreign-provider reasoning blocks (#1970)

langchain-google-genai==4.3.6

Changes since libs/genai/v4.3.5

release(genai): 4.3.6 (#1968) fix(genai): preserve text and reasoning content for AIMessages with tool calls in _parse_chat_history (#1967) chore(model-profiles): refresh model profile data (#1956)

Commits

• 3d9e491 release(genai): 4.3.7 (#1977)
• df0901b fix(genai): apply distinct indexes to repeated block types (#1974)
• 9bd41b7 chore: bump types-google-cloud-ndb from 2.4.0.20260518 to 2.4.0.20260724 in /...
• fcbb0d7 chore: bump the major group in /libs/community with 3 updates (#1920)
• 71a17cf chore: bump the minor-and-patch group across 1 directory with 6 updates (#1969)
• a6206c3 fix(vertexai): bump pyarrow dependency (#1962)
• d530f2f fix(genai): remove __del__ that closes a potentially shared client (#1963)
• bd39818 fix(genai): send skip_thought_signature_validator as a literal string (#1972)
• db7a432 test(genai): failing test for DUMMY_THOUGHT_SIGNATURE rejection (#1971)
• 85c160e fix(genai): drop foreign-provider reasoning blocks (#1970)
• Additional commits viewable in compare view

Updates langchain-core from 1.6.0 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)

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...
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore <dependency name> major version will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself)
• @dependabot ignore <dependency name> minor version will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself)
• @dependabot ignore <dependency name> will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself)
• @dependabot unignore <dependency name> will remove all of the ignore conditions of the specified dependency
• @dependabot unignore <dependency name> <ignore condition> will remove the ignore condition of the specified dependency and ignore conditions

[dependabot]

Labels

The following labels could not be found: python. Please create it before Dependabot can add it to a pull request.

Please fix the above issues or remove invalid values from dependabot.yml.