Bump compile sdk version and set ndk version

The last one required for rive:
https://github.com/rive-app/rive-flutter/blob/master/platform_considerations.md

Author: rolandgeider

android/app/build.gradle

@@ -55,7 +55,8 @@ if(wgerApiKey == null){
 }
 
 android {
-    compileSdkVersion 32
+    compileSdkVersion 33
+    ndkVersion "25.1.8937393"
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
@@ -69,7 +70,7 @@ android {
         // Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "de.wger.flutter"
         minSdkVersion 21
-        targetSdkVersion 32
+        targetSdkVersion 33
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         manifestPlaceholders += [WGER_API_KEY: wgerApiKey]