build: Bump to sdk 31

Author: libxzr

app/build.gradle

@@ -3,13 +3,13 @@ plugins {
 }
 
 android {
-    compileSdkVersion 30
-    buildToolsVersion "30.0.3"
+    compileSdkVersion 31
+    buildToolsVersion '31.0.0'
 
     defaultConfig {
         applicationId "xzr.hkf"
         minSdkVersion 11
-        targetSdkVersion 30
+        targetSdkVersion 31
         versionCode 2
         versionName "1.1"
     }