Bump langchain-core in /LLM/rag in the pip group across 1 directory

Bumps the pip group with 1 update in the /LLM/rag directory: [langchain-core](https://github.com/langchain-ai/langchain).


Updates `langchain-core` from 0.3.56 to 0.3.80
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==0.3.56...langchain-core==0.3.80)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 0.3.80
  dependency-type: direct:production
  dependency-group: pip
...

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

Author: dependabot[bot]

LLM/rag/requirements.txt

@@ -1,6 +1,6 @@
 langchain==0.3.24
 langchain-community==0.3.27
-langchain-core==0.3.56
+langchain-core==0.3.80
 langchain-huggingface==0.1.2
 huggingface-hub==0.29.1
 sentence-transformers==3.4.1