Update gradle_utils.dart and flutter.gradle to have the same versions as the documentation in file says is required. (#123213)

This was an oversight from pr
https://github.com/flutter/flutter/pull/116146/files.
Comments in both files indicate that the versions should be bumped
together.


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Author: reidbaker

packages/flutter_tools/lib/src/android/gradle_utils.dart

@@ -39,9 +39,9 @@ const String templateKotlinGradlePluginVersion = '1.7.10';
 // The remaining projects are: plugins, and modules compiled as AARs. In modules, the ephemeral directory
 // `.android` is always regenerated after flutter pub get, so new versions are picked up after a
 // Flutter upgrade.
-const String compileSdkVersion = '31';
+const String compileSdkVersion = '33';
 const String minSdkVersion = '16';
-const String targetSdkVersion = '31';
+const String targetSdkVersion = '33';
 const String ndkVersion = '23.1.7779620';
 
 // Update this when new versions of Gradle come out including minor versions