Add missing starlingx/utilities to coverage unit test

Fix the cover Zuul job by adding the missing starlingx/utilities as a
required project for the job. This new dependency was added by [1].

[1]: https://review.opendev.org/c/starlingx/distcloud-client/+/966267

Test plan:
1. PASS: Verify that Zuul runs the new job and that the reports are
   copied to the Zuul log output folder.

Story: 2011149
Task: 53681

Co-Authored-By: Raphael <Raphael.Lima@windriver.com>

Change-Id: Ia2b481e0e7ee750ceadf3cafd95faaf73bf5b25e
Signed-off-by: Gustavo Herzmann <gustavo.herzmann@windriver.com>

.zuul.yaml

@@ -77,6 +77,8 @@
     parent: tox
     description: Run coverage test for distcloud-client
     nodeset: debian-bullseye
+    required-projects:
+      - starlingx/utilities
     vars:
       python_version: 3.9
       tox_envlist: cover