chore(audience-sample): set Android managed stripping to High (SDK-312)

Matches the IL2CPP + High-stripping combination required by SDK-312's
verification matrix. iOS was already set to High (3) in SDK-295.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nattb8

examples/audience/ProjectSettings/ProjectSettings.asset

@@ -829,6 +829,7 @@ PlayerSettings:
     WebGL: 1
     Windows Store Apps: 1
     XboxOne: 1
+    Android: 3
     iPhone: 3
     tvOS: 1
   incrementalIl2cppBuild: {}