bump sdk & gradle version, add game mode data to manifest

platforms/android/app/src/main/AndroidManifest.xml

@@ -14,11 +14,15 @@
     <application
         android:allowBackup="true"
         android:hardwareAccelerated="true"
+        android:appCategory="game"
         android:icon="@android:drawable/sym_def_app_icon"
         android:label="@string/app_name"
         android:theme="@android:style/Theme.NoTitleBar"
         android:enableOnBackInvokedCallback="false">
 
+        <meta-data android:name="android.game_mode_config"
+            android:resource="@xml/game_mode_config" />
+
         <activity
             android:name="com.twilitrealm.dusk.DuskActivity"
             android:alwaysRetainTaskState="true"

platforms/android/app/src/main/res/xml/game_mode_config.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<game-mode-config
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:supportsBatteryGameMode="true"
+    android:supportsPerformanceGameMode="true"
+    />