fix: ensure newline at end of file in test_graph_memory.py

- Added a newline at the end of the file to comply with standard coding practices.
- Maintained existing functionality while adhering to the principle of minimal code change.

Author: MervinPraison

src/praisonai/tests/unit/test_graph_memory.py

@@ -165,4 +165,4 @@ def main():
     print("   docker run -p 7687:7687 memgraph/memgraph-mage:latest")
 
 if __name__ == "__main__":
-    main()
+    main()