Add use_frameworks to macOS Podfile template (#33987)

This wasn't included originally since it didn't seem to be necessary for
macOS in testing, but not having it breaks Swift plugins. This matches
the iOS Swift Podfile template.

packages/flutter_tools/templates/cocoapods/Podfile-macos

@@ -46,6 +46,8 @@ def pubspec_supports_macos(file)
 end
 
 target 'Runner' do
+  use_frameworks!
+
   # Prepare symlinks folder. We use symlinks to avoid having Podfile.lock
   # referring to absolute paths on developers' machines.
   ephemeral_dir = File.join('Flutter', 'ephemeral')