Bump langchain-openai from 0.3.0 to 1.1.12 in /langchain

Bumps [langchain-openai](https://github.com/langchain-ai/langchain) from 0.3.0 to 1.1.12.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-openai==0.3.0...langchain-openai==1.1.12)

---
updated-dependencies:
- dependency-name: langchain-openai
  dependency-version: 1.1.12
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

langchain/requirements.txt

@@ -1,3 +1,3 @@
 langchain==0.3.0
-langchain-openai==0.3.0
+langchain-openai==1.1.12
 requests==2.32.5