chore(deps): update node:8.16.0 docker digest to b9a98ae

Author: renovate-bot

.circleci/config.yml

@@ -6,7 +6,7 @@ machine:
 jobs:
   build:
     docker:
-      - image: node:8.16.0@sha256:957cab2653bde49d195e0a98c6ae0c1700ed51eb94fce30faadaceacf331a0a1
+      - image: node:8.16.0@sha256:b9a98aefdc235e5e378d2954102a467e094363d61eaa517bbe785a2cf5d159c0
     environment:
       - NPM_CONFIG_LOGLEVEL: warn
     working_directory: ~/repo