Use Ruby 2.6.5 CI images

Signed-off-by: Balasankar "Balu" C <balasankarc@autistici.org>

.gitlab-ci.yml

-image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.3-golang-1.12-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-postgresql-9.6-graphicsmagick-1.3.33"
+image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.5-golang-1.12-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-postgresql-9.6-graphicsmagick-1.3.33"
 
 stages:
   - sync

.gitlab/ci/frontend.gitlab-ci.yml

@@ -13,7 +13,7 @@
     - .default-before_script
     - .assets-compile-cache
     - .only:changes-code-backstage-qa
-  image: registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.3-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-graphicsmagick-1.3.33-docker-19.03.1
+  image: registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.5-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-graphicsmagick-1.3.33-docker-19.03.1
   stage: prepare
   services:
     - docker:19.03.0-dind

.gitlab/ci/global.gitlab-ci.yml

@@ -22,7 +22,7 @@
 # Jobs that only need to pull cache
 .default-cache:
   cache:
-    key: "debian-stretch-ruby-2.6.3-node-12.x"
+    key: "debian-stretch-ruby-2.6.5-node-12.x"
     paths:
       - .go/pkg/mod
       - vendor/ruby
@@ -202,7 +202,7 @@
     - name: redis:alpine
 
 .use-pg10:
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.3-golang-1.12-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-postgresql-10-graphicsmagick-1.3.33"
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.5-golang-1.12-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-postgresql-10-graphicsmagick-1.3.33"
   services:
     - name: postgres:10.9
       command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
@@ -216,7 +216,7 @@
     - name: elasticsearch:5.6.12
 
 .use-pg10-ee:
-  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.3-golang-1.12-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-postgresql-10-graphicsmagick-1.3.33"
+  image: "registry.gitlab.com/gitlab-org/gitlab-build-images:ruby-2.6.5-golang-1.12-git-2.24-lfs-2.9-chrome-73.0-node-12.x-yarn-1.16-postgresql-10-graphicsmagick-1.3.33"
   services:
     - name: postgres:10.9
       command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]