chore(deps): bump langchain-openai

Bumps [langchain-openai](https://github.com/langchain-ai/langchain) from 1.1.0 to 1.1.6.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-openai==1.1.0...langchain-openai==1.1.6)

---
updated-dependencies:
- dependency-name: langchain-openai
  dependency-version: 1.1.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

api/terraform/python/layer_langchain/requirements.txt

@@ -12,4 +12,4 @@
 # --------------------------
 langchain
 #langchain-experimental
-langchain-openai==1.1.0
+langchain-openai==1.1.6