Update to Android 11

Author: maxkoshevoi

samples/XCT.Sample.Android/Properties/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="com.companyname.xamarincommunitytoolkitsample" android:installLocation="auto">
-	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="29" />
+	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="30" />
 	<application android:label="XamarinCommunityToolkitSample.Android"></application>
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 	<uses-permission android:name="android.permission.INTERNET" />

samples/XCT.Sample.Android/Xamarin.CommunityToolkit.Sample.Android.csproj

@@ -16,7 +16,7 @@
     <AndroidManifest>Properties\AndroidManifest.xml</AndroidManifest>
     <MonoAndroidResourcePrefix>Resources</MonoAndroidResourcePrefix>
     <MonoAndroidAssetsPrefix>Assets</MonoAndroidAssetsPrefix>
-    <TargetFrameworkVersion>v10.0</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v11.0</TargetFrameworkVersion>
     <AndroidEnableSGenConcurrent>true</AndroidEnableSGenConcurrent>
     <AndroidUseAapt2>true</AndroidUseAapt2>
     <AndroidHttpClientHandlerType>Xamarin.Android.Net.AndroidClientHandler</AndroidHttpClientHandlerType>

src/CommunityToolkit/Xamarin.CommunityToolkit/Views/Snackbar/SnackBar.android.cs

@@ -4,7 +4,7 @@
 using Xamarin.Forms.Platform.Android;
 using Xamarin.CommunityToolkit.UI.Views.Options;
 using Android.Util;
-#if MONOANDROID10_0
+#if MONOANDROID11_0
 using AndroidSnackBar = Google.Android.Material.Snackbar.Snackbar;
 #else
 using AndroidSnackBar = Android.Support.Design.Widget.Snackbar;