Update packages to remove dependency on Xamarin.Android.Support.v4 library.

Author: Giorgi

Plugin.FirebasePushNotification/DefaultPushNotificationHandler.android.cs

@@ -14,6 +14,7 @@
 using System.Collections.ObjectModel;
 using Android.Content.PM;
 using Android.Content.Res;
+using AndroidX.Core.App;
 using Java.Util;
 using static Android.App.ActivityManager;
 

Plugin.FirebasePushNotification/Plugin.FirebasePushNotification.csproj

@@ -108,13 +108,11 @@
     <AndroidResource Include="Resources\**\*.json" Generator="MSBuild:UpdateAndroidResources" />
     <Compile Include="**\*.android.cs" />
     <Compile Include="**\*.android.*.cs" />
-    <PackageReference Include="Xamarin.Android.Support.v4" Version="28.0.0.3" />
     <PackageReference Include="Xamarin.Firebase.Common" Version="71.1610.0" />
     <PackageReference Include="Xamarin.Firebase.Messaging" Version="71.1740.0" />
-    <PackageReference Include="Xamarin.GooglePlayServices.Base" Version="71.1610.0" />
-    <PackageReference Include="Xamarin.GooglePlayServices.Basement" Version="71.1620.0" />
-    <PackageReference Include="Xamarin.GooglePlayServices.Tasks" Version="71.1601.0" />
-    
+    <PackageReference Include="Xamarin.GooglePlayServices.Base" Version=" 117.4.0" />
+    <PackageReference Include="Xamarin.GooglePlayServices.Basement" Version="117.4.0" />
+    <PackageReference Include="Xamarin.GooglePlayServices.Tasks" Version="117.2.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('tizen')) ">