OLPHttpTask to lock toIgnoreResponse before usage (#1560)

It is 'synchronized' in the didCompleteWithError callback so it's better
to add 'synchronized' in the restarting as well

Relates-To: DATASDK-45

Signed-off-by: Rustam Gamidov <ext-rustam.gamidov@here.com>

olp-cpp-sdk-core/src/http/ios/OLPHttpTask.mm

@@ -98,7 +98,9 @@ - (OLPHttpTaskStatus)restart {
   }
 
   if (_dataTask) {
-    _httpClient.toIgnoreResponse[_dataTask.taskDescription] = _dataTask;
+    @synchronized(_httpClient.toIgnoreResponse) {
+      _httpClient.toIgnoreResponse[_dataTask.taskDescription] = _dataTask;
+    }
     [_dataTask cancel];
     _dataTask = nil;
   }