Marks Windows_mokey basic_material_app_win__compile to be flaky (flutter#173702)

<!-- meta-tags: To be used by the automation script only, DO NOT MODIFY.
{
  "name": "Windows_mokey basic_material_app_win__compile"
}
-->
Issue link: flutter#173701

Author: fluttergithubbot

.ci.yaml

@@ -6832,6 +6832,7 @@ targets:
 
   # windows mokey test
   - name: Windows_mokey basic_material_app_win__compile
+    bringup: true # Flaky https://github.com/flutter/flutter/issues/173701
     recipe: devicelab/devicelab_drone
     presubmit: false
     timeout: 60