Update gitlab-monitor to 2.13.0

CHANGELOG.md

@@ -7,6 +7,7 @@ omnibus-gitlab repository.
 - Force kill unicorn process if it is still running after a TERM or INT signal
 - Upgrade Ruby version to 2.3.7
+- Update gitlab-monitor to 2.13.0
 - Add Prometheus Alertmanager
 - Bump git to 2.16.3
 - Bump curl to 7.59.0 aab088263

config/software/gitlab-monitor.rb

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
-version = Gitlab::Version.new('gitlab-monitor', '2.5.0')
+version = Gitlab::Version.new('gitlab-monitor', '2.13.0')
 default_version version.print