Marks Linux android_release_builds_exclude_dev_dependencies_test to be unflaky (flutter#160074)

<!-- meta-tags: To be used by the automation script only, DO NOT MODIFY.
{
  "name": "Linux android_release_builds_exclude_dev_dependencies_test"
}
-->
The test has been passing for [50 consecutive
runs](https://data.corp.google.com/sites/flutter_infra_metrics_datasite/flutter_check_test_flakiness_status_dashboard/?p=BUILDER_NAME:%22Linux%20android_release_builds_exclude_dev_dependencies_test%22).
This test can be marked as unflaky.

Author: fluttergithubbot

.ci.yaml

@@ -1081,7 +1081,6 @@ targets:
   - name: Linux android_release_builds_exclude_dev_dependencies_test
     recipe: devicelab/devicelab_drone
     timeout: 60
-    bringup: true
     properties:
       dependencies: >-
         [