Fix formatting with black

backend/app/routers/proposal.py

@@ -8,6 +8,7 @@ from app.dependencies import get_db
 
 router = APIRouter()
 
+
 @router.get("/", response_model=List[ProposalSchema])
 async def get_proposals(db: Session = Depends(get_db)):
-    return db.query(ProposalModel).all()
+    return db.query(ProposalModel).all()