Bump langchain-core from 0.2.2 to 0.3.80 in /ai/python-rag-chatbot

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 0.2.2 to 0.3.80.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-core==0.2.2...langchain-core==0.3.80)

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

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

Author: dependabot[bot]

ai/python-rag-chatbot/requirements.txt

@@ -95,7 +95,7 @@ langchain==0.3.7
 langchain-cli==0.0.24
 langchain-cohere==0.1.5
 langchain-community==0.3.0
-langchain-core==0.2.2
+langchain-core==0.3.80
 langchain-text-splitters==0.2.0
 langchainhub==0.1.13
 langdetect==1.0.9