Bump langchain-core from 0.1.42 to 0.1.53 in /Chapter9_notebooks

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 0.1.42 to 0.1.53.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](https://github.com/langchain-ai/langchain/commits/langchain-core==0.1.53)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 0.1.53
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Chapter9_notebooks/requirements__Ch9_Advanced_LangChain_Configurations_and_Pipeline.txt

@@ -2,7 +2,7 @@ faiss-cpu==1.8.0
 gpt4all==1.0.12
 langchain==0.1.16
 langchain-community==0.0.32
-langchain-core==0.1.42
+langchain-core==0.1.53
 langchain-text-splitters==0.0.1
 openai==0.28.1
 sentence-transformers==2.6.1

Chapter9_notebooks/requirements__Ch9_Advanced_Methods_with_Chains.txt

@@ -1,5 +1,5 @@
 langchain==0.1.16
 langchain-community==0.0.32
-langchain-core==0.1.42
+langchain-core==0.1.53
 langchain-openai==0.1.3
 langchain-text-splitters==0.0.1