Fix quoting in presubmit.yml (#1295)

Author: meteorcloudy

.bazelci/presubmit.yml

@@ -6,7 +6,7 @@ platforms:
   ubuntu1804:
     test_targets:
     - "//..."
-    skip_in_bazel_downstream_pipeline: "Newer abseil-cpp introduced doesn't work on this old platform"
+    skip_in_bazel_downstream_pipeline: "Newer abseil-cpp introduced no longer works on this old platform"
   ubuntu2004:
     test_targets:
     - "//..."