build(deps): bump langchain-core

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 0.3.59 to 0.3.81.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==0.3.59...langchain-core==0.3.81)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 0.3.81
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ai/generative-ai-service/Document Processing with GenAI/multi-modal-document-extraction/requirements.txt

@@ -1,5 +1,5 @@
 langchain_community==0.3.24
-langchain_core==0.3.59
+langchain_core==0.3.81
 pdf2image==1.17.0
 streamlit==1.41.0
 oci==2.150.3