Update GitHub URL for failing android_semantics_integration_test bringup (flutter#160993)

This should have been marked unflaky when
flutter#124636 was fixed with
flutter#127128. However it wasn't, and
is now failing on a legit behavior change the test caught.

The test is now failing due to
flutter#153594, and if this test
hadn't been marked flaky the commit in question would closed the tree
and been reverted.

Author: jmagman

.ci.yaml

@@ -2358,7 +2358,7 @@ targets:
 
   - name: Linux_pixel_7pro android_semantics_integration_test
     recipe: devicelab/devicelab_drone
-    bringup: true # Flaky: https://github.com/flutter/flutter/issues/124636
+    bringup: true # Failing: https://github.com/flutter/flutter/issues/153594
     presubmit: false
     timeout: 60
     properties: