Update Android SDK to 5.6.0

Author: github-actions[bot]

OneSignalExample/Assets/Plugins/Android/mainTemplate.gradle

@@ -7,7 +7,7 @@ apply from: '../shared/keepUnitySymbols.gradle'
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 // Android Resolver Dependencies Start
-    implementation 'com.onesignal:OneSignal:5.4.2' // Packages/com.onesignal.unity.android/Editor/OneSignalAndroidDependencies.xml:6
+    implementation 'com.onesignal:OneSignal:5.6.0' // Packages/com.onesignal.unity.android/Editor/OneSignalAndroidDependencies.xml:6
 // Android Resolver Dependencies End
 **DEPS**}
 

OneSignalExample/ProjectSettings/AndroidResolverDependencies.xml

@@ -1,6 +1,6 @@
 <dependencies>
   <packages>
-    <package>com.onesignal:OneSignal:5.4.2</package>
+    <package>com.onesignal:OneSignal:5.6.0</package>
   </packages>
   <files />
   <settings>

com.onesignal.unity.android/Editor/OneSignalAndroidDependencies.xml

@@ -3,6 +3,6 @@
     <repositories>
       <repository>https://repo.maven.apache.org/maven2</repository>
     </repositories>
-    <androidPackage spec="com.onesignal:OneSignal:5.4.2" />
+    <androidPackage spec="com.onesignal:OneSignal:5.6.0" />
   </androidPackages>
 </dependencies>