chore(deps): update node:8.16.0 docker digest to 310db2a

Author: renovate-bot

.circleci/config.yml

@@ -6,7 +6,7 @@ machine:
 jobs:
   build:
     docker:
-      - image: node:8.16.0@sha256:39c16ad02f3db2051eaeff61e3ecb7f23a03610bc9acdc0ab5660f48582223d7
+      - image: node:8.16.0@sha256:310db2abcff097ef44af205d81833282a6d5471002a1b59d7b7459a74152c856
     environment:
       - NPM_CONFIG_LOGLEVEL: warn
     working_directory: ~/repo