fix(gitlab-ci): update coverage reporting in CI

Gitlab 14.10 introduced a coverage_report key which obsoletes the old
way of reporting coverage data.

.gitlab-ci.yml

@@ -53,7 +53,9 @@ test:
   coverage: '/TOTAL.*\s+(\d+\%)/'
   artifacts:
     reports:
-      cobertura: coverage.xml
+      coverage_report:
+        coverage_format: cobertura
+        path: coverage.xml
 
 deploy:
   stage: deploy