Update /tmp/images/ci_files/variables.yml for 12.8.9-ee

ci_files/variables.yml

 ---
 variables:
   GITLAB_ELASTICSEARCH_INDEXER_VERSION: v2.1.0
-  GITLAB_VERSION: v12.8.8-ee
-  GITLAB_REF_SLUG: v12.8.8-ee
-  GITLAB_ASSETS_TAG: v12.8.8-ee
+  GITLAB_VERSION: v12.8.9-ee
+  GITLAB_REF_SLUG: v12.8.9-ee
+  GITLAB_ASSETS_TAG: v12.8.9-ee
   GITLAB_EXPORTER_VERSION: 6.1.0
   GITLAB_SHELL_VERSION: v11.0.0
-  GITLAB_WORKHORSE_VERSION: v8.21.1
+  GITLAB_WORKHORSE_VERSION: v8.21.2
   GITLAB_CONTAINER_REGISTRY_VERSION: v2.8.1-gitlab
-  GITALY_SERVER_VERSION: v12.8.8
+  GITALY_SERVER_VERSION: v12.8.9
   GIT_VERSION: 2.24.1
   GO_VERSION: 1.12.13
   KUBECTL_VERSION: 1.13.12