fix(app-check, android): fix unnecessary deprecation warning (#12578)

Author: russellwheatley

packages/firebase_app_check/firebase_app_check/android/src/main/java/io/flutter/plugins/firebase/appcheck/FlutterFirebaseAppCheckPlugin.java

@@ -16,7 +16,7 @@
 import com.google.firebase.appcheck.FirebaseAppCheck;
 import com.google.firebase.appcheck.debug.DebugAppCheckProviderFactory;
 import com.google.firebase.appcheck.playintegrity.PlayIntegrityAppCheckProviderFactory;
-import com.google.firebase.appcheck.safetynet.SafetyNetAppCheckProviderFactory;
+import com.google.firebase.appcheck.safetynet.*;
 import io.flutter.embedding.engine.plugins.FlutterPlugin;
 import io.flutter.plugin.common.BinaryMessenger;
 import io.flutter.plugin.common.EventChannel;
@@ -88,6 +88,8 @@ private Task<String> getLimitedUseAppCheckToken(Map<String, Object> arguments) {
     return taskCompletionSource.getTask();
   }
 
+  // SafetyNet is deprecated and is already annotated as such on the user facing Dart API. Please remove annotation when SafetyNet is removed.
+  @SuppressWarnings("deprecation")
   private Task<Void> activate(Map<String, Object> arguments) {
     TaskCompletionSource<Void> taskCompletionSource = new TaskCompletionSource<>();