Remove explicit Response for endpoints returning HTTP 204 status code

gns3server/api/routes/controller/symbols.py

@@ -95,7 +95,7 @@ def get_default_symbols() -> dict:
     dependencies=[Depends(get_current_active_user)],
     status_code=status.HTTP_204_NO_CONTENT
 )
-async def upload_symbol(symbol_id: str, request: Request) -> Response:
+async def upload_symbol(symbol_id: str, request: Request) -> None:
     """
     Upload a symbol file.
     """
@@ -112,4 +112,3 @@ async def upload_symbol(symbol_id: str, request: Request) -> Response:
     # Reset the symbol list
     controller.symbols.list()
 
-    return Response(status_code=status.HTTP_204_NO_CONTENT)