Handle CLI failure exit status at the top-level script (#28322)

spec/lib/mastodon/cli/cache_spec.rb

@@ -64,8 +64,7 @@ describe Mastodon::CLI::Cache do
 
       it 'Exits with an error message' do
         expect { subject }
-          .to output_results('Unknown')
-          .and raise_error(SystemExit)
+          .to raise_error(Thor::Error, /Unknown/)
       end
     end
   end