Bump ruby version

.gitlab-ci.yml

-image: "dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.3-git-2.7-phantomjs-2.1"
+image: "dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.3.3-git-2.7-phantomjs-2.1-node-7.1"
 
 cache:
-  key: "ruby-231"
+  key: "ruby-233"
   paths:
   - vendor/ruby
 
@@ -235,7 +235,7 @@ rake ee_compat_check:
     - /^[\d-]+-stable(-ee)?$/
   allow_failure: yes
   cache:
-    key: "ruby231-ee_compat_check_repo"
+    key: "ruby233-ee_compat_check_repo"
     paths:
       - ee_compat_check/repo/
       - vendor/ruby
@@ -277,8 +277,6 @@ teaspoon:
   stage: test
   <<: *use-db
   script:
-    - curl --silent --location https://deb.nodesource.com/setup_6.x | bash -
-    - apt-get install --assume-yes nodejs
     - npm install
     - npm link istanbul
     - rake teaspoon

.ruby-version

-2.3.1
+2.3.3

changelogs/unreleased/zj-use-ruby-2-3-3.yml

+---
+title: Bump ruby version to 2.3.3
+merge_request: 7904
+author: 

doc/install/installation.md

@@ -123,9 +123,9 @@ Remove the old Ruby 1.8 if present:
 Download Ruby and compile it:
 
     mkdir /tmp/ruby && cd /tmp/ruby
-    curl --remote-name --progress https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.1.tar.gz
-    echo 'c39b4001f7acb4e334cb60a0f4df72d434bef711  ruby-2.3.1.tar.gz' | shasum -c - && tar xzf ruby-2.3.1.tar.gz
-    cd ruby-2.3.1
+    curl --remote-name --progress https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.3.tar.gz
+    echo 'a8db9ce7f9110320f33b8325200e3ecfbd2b534b ruby-2.3.3.tar.gz' | shasum -c - && tar xzf ruby-2.3.3.tar.gz
+    cd ruby-2.3.3
     ./configure --disable-install-rdoc
     make
     sudo make install