style: remove trailing whitespace in main.py

This commit removes an unnecessary trailing whitespace in the main.py file, improving code readability and adhering to coding standards.

Author: sharrlotte

app/main.py

@@ -43,7 +43,7 @@ class ResponseRequest(BaseModel):
 # Remove the global session
 engine = create_engine(POSTGRES_URL)
 Session = sessionmaker(bind=engine)
-w
+
 # Why watchtower not updating?
 
 # Add dependency for session management