Raise Android min API to 30, update deprecated GitHub Actions

Co-authored-by: winnerspiros <1675249+winnerspiros@users.noreply.github.com>
Agent-Logs-Url: https://github.com/winnerspiros/osu/sessions/b6cdde36-04c4-4f15-927d-110644a5e205

Author: Copilot

osu.Android.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <SupportedOSPlatformVersion>21.0</SupportedOSPlatformVersion>
+    <SupportedOSPlatformVersion>30.0</SupportedOSPlatformVersion>
     <RuntimeIdentifiers>android-x86;android-arm;android-arm64</RuntimeIdentifiers>
     <AndroidPackageFormat>apk</AndroidPackageFormat>
     <MandroidI18n>CJK;Mideast;Rare;West;Other;</MandroidI18n>

osu.Android/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="sh.ppy.osulazer" android:installLocation="auto">
-	<uses-sdk android:minSdkVersion="21" android:targetSdkVersion="34" />
+	<uses-sdk android:minSdkVersion="30" android:targetSdkVersion="34" />
 	<application android:allowBackup="true"
 				 android:supportsRtl="true"
 				 android:label="osu!"

osu.Android/OsuGameActivity.cs

@@ -76,9 +76,7 @@ protected override void OnStart()
             try
             {
                 // Request unbuffered touch dispatch for lower input latency during gameplay.
-                // View.RequestUnbufferedDispatch(int) requires Android API 30+.
-                if (OperatingSystem.IsAndroidVersionAtLeast(30))
-                    Window?.DecorView?.RequestUnbufferedDispatch((int)InputSourceType.Touchscreen);
+                Window?.DecorView?.RequestUnbufferedDispatch((int)InputSourceType.Touchscreen);
             }
             catch (Exception e)
             {
@@ -157,9 +155,7 @@ public void ApplyPerformanceOptimizations(bool enabled)
             {
                 try
                 {
-                    // SetSustainedPerformanceMode requires Android API 24+.
-                    if (OperatingSystem.IsAndroidVersionAtLeast(24))
-                        Window?.SetSustainedPerformanceMode(enabled);
+                    Window?.SetSustainedPerformanceMode(enabled);
 
                     if (enabled)
                         selectHighestRefreshRate();
@@ -173,11 +169,6 @@ public void ApplyPerformanceOptimizations(bool enabled)
 
         private void selectHighestRefreshRate()
         {
-            // Display.GetSupportedModes(), Display.Mode.RefreshRate, Display.Mode.ModeId, and
-            // WindowManagerLayoutParams.PreferredDisplayModeId require Android API 23+.
-            if (!OperatingSystem.IsAndroidVersionAtLeast(23))
-                return;
-
             try
             {
                 var display = WindowManager?.DefaultDisplay;