updating huawei version in the example integration

Author: ArtursKadikis

app/build.gradle

@@ -95,7 +95,7 @@ dependencies {
     //required for FCM push
     implementation 'com.google.firebase:firebase-messaging:22.0.0'
     //required for huawei push
-    implementation 'com.huawei.hms:push:5.3.0.304'
+    implementation 'com.huawei.hms:push:6.3.0.304'
 
     implementation 'com.google.android.material:material:1.6.0-alpha02'
     implementation 'androidx.appcompat:appcompat:1.4.1'