use prevent-rollback when variable name is version

gitlab/deploy.yml

 .deploy-template:
   stage: deploy
   before_script:
-    - curl https://git.iwoca.co.uk/devops/ci/raw/4.0.8/scripts/deploy.sh > deploy.sh
+    - curl https://git.iwoca.co.uk/devops/ci/raw/4.0.9/scripts/deploy.sh > deploy.sh
     - chmod +x deploy.sh
   script:
     - eval VARIABLE="${VARIABLE}" # evaluate variable used in job definition