Use the setting passed as the default content type if global and loca…

…l produces are missing

src/Microsoft.OpenApi.Readers/V2/OpenApiResponseDeserializer.cs

@@ -74,7 +74,7 @@ private static void ProcessProduces(MapNode mapNode, OpenApiResponse response, P
 
             var produces = context.GetFromTempStorage<List<string>>(TempStorageKeys.OperationProduces)
                 ?? context.GetFromTempStorage<List<string>>(TempStorageKeys.GlobalProduces)
-                ?? new List<string> { "application/octet-stream" };
+                ?? context.DefaultContentType ?? new List<string> { "application/octet-stream" };
 
             var schema = context.GetFromTempStorage<OpenApiSchema>(TempStorageKeys.ResponseSchema, response);