chore(deps): update deliveroo/circleci docker tag to v4

Author: renovate-a-roo[bot]

.circleci/config.yml

@@ -16,7 +16,7 @@ version: 2
 
 defaults: &defaults
   docker:
-  - image: deliveroo/circleci:0.4.2
+  - image: deliveroo/circleci:4.9.6
     <<: *global_dockerhub_auth
 
 workflows: