dependency fix

Author: dishaprakash

requirements.txt

@@ -4,7 +4,6 @@ langchain-core==0.3.67
 numpy==2.3.1; python_version >= "3.11"
 numpy==2.2.6; python_version == "3.10"
 numpy==2.0.2; python_version <= "3.9"
-pgvector==0.4.0
 SQLAlchemy[asyncio]==2.0.41
 langgraph==0.5.0
 langchain-postgres==0.0.15