Bump langchain from 0.0.306 to 0.0.329 in /kendra_retriever_samples

Bumps [langchain](https://github.com/langchain-ai/langchain) from 0.0.306 to 0.0.329.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@v0.0.306...v0.0.329)

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

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

kendra_retriever_samples/requirements.txt

@@ -1,4 +1,4 @@
-langchain==0.0.306
+langchain==0.0.329
 boto3>=1.28.27
 openai
 anthropic