Fix the iOS network race when accessing sessions (#1200)

Make sure that access to urlSessions variable is synchronized.

Resolves: OLPSUP-14072

Signed-off-by: Mykhailo Kuchma <[email protected]>

Author: mykhailo-kuchma

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

@@ -111,8 +111,8 @@ - (OLPHttpTask*)createTaskWithProxy:
                                                 andURLSession:session
                                                         andId:identifier];
 
-  self.urlSessions[@(identifier)] = session;
   @synchronized(self.tasks) {
+    self.urlSessions[@(identifier)] = session;
     self.tasks[@(identifier)] = task;
   }