chore(deps): bump langchain-core from 0.3.65 to 0.3.67

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 0.3.65 to 0.3.67.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==0.3.65...langchain-core==0.3.67)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 0.3.67
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/base.txt

@@ -2,7 +2,7 @@
 isort==6.0.1
 langchain==0.3.25
 langchain-community==0.3.21
-langchain-core==0.3.65
+langchain-core==0.3.67
 langchain-experimental==0.3.4
 langchain-openai==0.3.24
 langchain-pinecone==0.2.8