Update targetSdkVersion to 34

android/app/build.gradle

@@ -63,7 +63,7 @@ android {
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
         minSdkVersion 21
-        targetSdkVersion 28
+        targetSdkVersion 34
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }