chore(deps): update node:8.16.0 docker digest to 717f84f

Author: renovate-bot

.circleci/config.yml

@@ -6,7 +6,7 @@ machine:
 jobs:
   build:
     docker:
-      - image: node:8.16.0@sha256:b5484d1eece03b69a2222c8444ac32730e7d0ed6be8af7304d9d0b5fd691a950
+      - image: node:8.16.0@sha256:717f84f9aa6a51a5c2914100812937261551e50a88f2323acc0b1d43a081b6e2
     environment:
       - NPM_CONFIG_LOGLEVEL: warn
     working_directory: ~/repo