Merge pull request #13232

* PGVector needs to close its connection if its garbage collected

libs/langchain/langchain/vectorstores/pgvector.py

@@ -147,6 +147,10 @@ class PGVector(VectorStore):
         self.create_tables_if_not_exists()
         self.create_collection()
 
+    def __del__(self) -> None:
+        if self._conn:
+            self._conn.close()
+
     @property
     def embeddings(self) -> Embeddings:
         return self.embedding_function