Bump langchain-community in /lambda/summarization/document_reader

Bumps [langchain-community](https://github.com/langchain-ai/langchain) from 0.2.5 to 0.2.19.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-community==0.2.5...langchain-community==0.2.19)

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

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

Author: dependabot[bot]

lambda/summarization/document_reader/requirements.txt

@@ -1,7 +1,7 @@
 redis
 pypdf==4.2.0
 langchain==0.2.5
-langchain-community==0.2.5
+langchain-community==0.2.19
 urllib3<2
 aws-xray-sdk
 aws-lambda-powertools