CI: use gitlab/gitlab chart master

Update review app to make use of latest released gitlab/gitlab Helm
chart.
Signed-off-by: Rémy Coutable <remy@rymai.me>

.gitlab/ci/review.gitlab-ci.yml

@@ -53,7 +53,7 @@ review-build-cng:
   variables:
     HOST_SUFFIX: "${CI_ENVIRONMENT_SLUG}"
     DOMAIN: "-${CI_ENVIRONMENT_SLUG}.${REVIEW_APPS_DOMAIN}"
-    GITLAB_HELM_CHART_REF: "v3.3.3"
+    GITLAB_HELM_CHART_REF: "master"
   environment:
     name: review/${CI_COMMIT_REF_NAME}
     url: https://gitlab-${CI_ENVIRONMENT_SLUG}.${REVIEW_APPS_DOMAIN}