Update ios sdk version

build.cake

@@ -13,7 +13,7 @@ using NuGet;
 
 // Native SDK versions
 var AndroidSdkVersion = "2.5.0-4+20e844533";
-var IosSdkVersion = "2.5.1-1+b181dfabecabc6908810d7bb0264724ae72f0ba7";
+var IosSdkVersion = "2.5.1-4+3e9b3421ede2574aba089afa04ff24c8c953a759";
 var UwpSdkVersion = "2.5.0";
 
 // URLs for downloading binaries.