chore(deps): update node:8.16.1 docker digest to c1c738e

Author: renovate-bot

.circleci/config.yml

@@ -6,7 +6,7 @@ machine:
 jobs:
   build:
     docker:
-      - image: node:8.16.1@sha256:ab0774da3ecc553885dc775db39c73a2d5163528bac26657fa79b22971e7d28c
+      - image: node:8.16.1@sha256:c1c738e90e6c1f1f44043be5d0e77f1f16253b50ec4d98ab0f887fca72820a95
     environment:
       - NPM_CONFIG_LOGLEVEL: warn
     working_directory: ~/repo