build(deps): Bump langchain-core from 1.4.8 to 1.4.9

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 1.4.8 to 1.4.9.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==1.4.8...langchain-core==1.4.9)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 1.4.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

authbridge/requirements.txt

@@ -2,7 +2,7 @@ python-keycloak>=7.1.1,<8
 PyYAML>=6.0.3
 
 langgraph==1.2.5
-langchain-core==1.4.8
+langchain-core==1.4.9
 langchain-openai==1.3.4
 pydantic==2.13.4