Fix f string

bigbluebutton/django/views.py

@@ -64,7 +64,7 @@ class APIView(View):
             return self._success("", res)
         except TypeError:
             return self._error(
-                404, "xInfraBlueUnknownAPICall", "The API call {method} is not known"
+                404, "xInfraBlueUnknownAPICall", f"The API call {method} is not known"
             )
 
     def _xml_response(