Bump langchain-openai from 1.0.2 to 1.0.3 (#5478)

Bumps [langchain-openai](https://github.com/langchain-ai/langchain) from 1.0.2 to 1.0.3.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-openai==1.0.2...langchain-openai==1.0.3)

---
updated-dependencies:
- dependency-name: langchain-openai
  dependency-version: 1.0.3
  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

@@ -8,7 +8,7 @@ langchain-classic==1.0.0
 langchain-community==0.4.1
 langchain-google-genai==3.0.3
 langchain-mistralai==1.0.1
-langchain-openai==1.0.2
+langchain-openai==1.0.3
 langgraph==1.0.2
 libmozdata==0.2.12
 llama-cpp-python==0.2.90