chore(deps): update node:8.16.0 docker digest to c671dc2

Author: renovate-bot

.circleci/config.yml

@@ -6,7 +6,7 @@ machine:
 jobs:
   build:
     docker:
-      - image: node:8.16.0@sha256:310db2abcff097ef44af205d81833282a6d5471002a1b59d7b7459a74152c856
+      - image: node:8.16.0@sha256:c671dc2c9148c8f4a5c2ae2cd8b3524179a44dc35c924a947ce71c23c0529c12
     environment:
       - NPM_CONFIG_LOGLEVEL: warn
     working_directory: ~/repo