chore(deps): update node:8.16.0 docker digest to 2f614cd

Author: renovate-bot

.circleci/config.yml

@@ -6,7 +6,7 @@ machine:
 jobs:
   build:
     docker:
-      - image: node:8.16.0@sha256:ee7adf8240cd6e06d96b459c69a7900bd8a044accc74ee2f3ae7d432c8d034e5
+      - image: node:8.16.0@sha256:2f614cda37edd3cfea0ae2d733c5c58ce4d5bc433b6115cb6ea06f0ead3c623f
     environment:
       - NPM_CONFIG_LOGLEVEL: warn
     working_directory: ~/repo