Bump auto-deploy-image version in the latest Deploy.gitlab-ci.yml

This commit bumpes the auto-deploy-image version in the
latest Deploy.gitlab-ci.yml, which is optional template for
users.

lib/gitlab/ci/templates/Jobs/Deploy.latest.gitlab-ci.yml

 .auto-deploy:
-  image: "registry.gitlab.com/gitlab-org/cluster-integration/auto-deploy-image:v2.0.0-beta.2"
+  image: "registry.gitlab.com/gitlab-org/cluster-integration/auto-deploy-image:v2.0.0"
   dependencies: []
 
 review: