Update /tmp/images/ci_files/variables.yml for 13.0.4

ci_files/variables.yml

 ---
 variables:
   GITLAB_ELASTICSEARCH_INDEXER_VERSION: v2.3.0
-  GITLAB_VERSION: v13.0.3-ee
-  GITLAB_REF_SLUG: v13.0.3-ee
-  GITLAB_ASSETS_TAG: v13.0.3-ee
+  GITLAB_VERSION: v13.0.4
+  GITLAB_REF_SLUG: v13.0.4
+  GITLAB_ASSETS_TAG: v13.0.4
   GITLAB_EXPORTER_VERSION: 7.0.3
   GITLAB_SHELL_VERSION: v13.2.0
   GITLAB_WORKHORSE_VERSION: v8.31.1
   GITLAB_CONTAINER_REGISTRY_VERSION: v2.9.1-gitlab
-  GITALY_SERVER_VERSION: v13.0.3
+  GITALY_SERVER_VERSION: v13.0.4
   GIT_VERSION: 2.26.2
   GO_VERSION: 1.13.9
   KUBECTL_VERSION: 1.13.12