Bump langchain-core in /NLP/Preprocessing Unstructured Data

Bumps [langchain-core](https://github.com/langchain-ai/langchain) from 0.1.19 to 1.2.28.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain==0.1.19...langchain-core==1.2.28)

---
updated-dependencies:
- dependency-name: langchain-core
  dependency-version: 1.2.28
  dependency-type: direct:production
...

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

Author: dependabot[bot]

NLP/Preprocessing Unstructured Data/requirements.txt

@@ -1,7 +1,7 @@
 chromadb==0.4.22
 langchain==0.1.5
 langchain-community==0.0.17
-langchain-core==0.1.19
+langchain-core==1.2.28
 langchain-openai==0.0.5
 openai==1.11.1
 tiktoken==0.5.2