chore(deps): update langchain requirement from <0.1.11 to <0.3.28

Updates the requirements on [langchain](https://github.com/langchain-ai/langchain) to permit the latest version.
- [Release notes](https://github.com/langchain-ai/langchain/releases)
- [Commits](langchain-ai/langchain@langchain-box==0.1.0...langchain==0.3.27)

---
updated-dependencies:
- dependency-name: langchain
  dependency-version: 0.3.27
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.blocklist.txt

@@ -24,7 +24,7 @@ langchain_experimental
 # Affected: langchain <= 0.1.10, langchain-core < 0.1.29
 # Note: This codebase uses langchain-core>=0.3.80 (safe), but blocking
 # the old langchain package prevents accidental installation
-langchain<0.1.11
+langchain<0.3.28
 
 # Other potentially dangerous packages
 # (Add more as needed)