Updates GitLab CI file

Issue: documentacao-e-tarefas/scielo#766

Signed-off-by: Jhon <jhon@lepidus.com.br>

Author: JhonathanLepidus

.gitlab-ci.yml

@@ -3,7 +3,7 @@ variables:
 
 include:
   - project: 'documentacao-e-tarefas/modelosparaintegracaocontinua'
-    ref: main
+    ref: stable-3_3_0
     file:
       - 'templates/groups/pkp_plugin.yml'
-      - 'templates/groups/ops_plugins_unit_tests_model.yml'
+      - 'templates/groups/ops/unit_tests.yml'