Update langchain-openai requirement

Updates the requirements on [langchain-openai](https://github.com/langchain-ai/langchain) to permit the latest version.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-openai==0.1.5...langchain-openai==0.3.0)

---
updated-dependencies:
- dependency-name: langchain-openai
  dependency-type: direct:production
...

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

Author: dependabot[bot]

topic/machine-learning/llm-langchain/requirements.txt

@@ -2,7 +2,7 @@ crash
 google-cloud-aiplatform<2
 langchain-cratedb<0.1.1
 langchain-google-vertexai<3
-langchain-openai<0.3
+langchain-openai<0.4
 langchain-text-splitters<0.4
 pueblo[cli,nlp]>=0.0.10
 pypdf<6