Bump langchain-anthropic from 0.3.17 to 0.3.18 (#5175)

Bumps [langchain-anthropic](https://github.com/langchain-ai/langchain) from 0.3.17 to 0.3.18.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-anthropic==0.3.17...langchain-anthropic==0.3.18)

---
updated-dependencies:
- dependency-name: langchain-anthropic
  dependency-version: 0.3.18
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -3,7 +3,7 @@ beautifulsoup4==4.13.4
 boto3==1.40.1
 imbalanced-learn==0.13.0
 langchain==0.3.27
-langchain-anthropic==0.3.17
+langchain-anthropic==0.3.18
 langchain-community==0.3.27
 langchain-google-genai==2.1.8
 langchain-mistralai==0.2.11