build(deps): Bump langchain-openai from 1.3.2 to 1.3.4

Bumps [langchain-openai](https://github.com/langchain-ai/langchain) from 1.3.2 to 1.3.4.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-openai==1.3.2...langchain-openai==1.3.4)

---
updated-dependencies:
- dependency-name: langchain-openai
  dependency-version: 1.3.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

authbridge/requirements.txt

@@ -3,7 +3,7 @@ PyYAML>=6.0.3
 
 langgraph==1.2.5
 langchain-core==1.4.8
-langchain-openai==1.3.2
+langchain-openai==1.3.4
 pydantic==2.13.4
 
 python-dotenv>=1.2.2