Revert "Merge pull request mozilla#139 from mozilla/renovate/node-8.1…

…1.3"

Seeing some out-of-memory errors on attempt to deploy the service,
which seem to have started with this Docker image upgrade

This reverts commit 48b33da, reversing
changes made to 0d6eb92.

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 jobs:
   test:
     docker:
-      - image: circleci/node:8.11.3@sha256:339b91052ff2f433453a963138fceb39edad08ec6398f17aaa91c34b9cf775ba
+      - image: circleci/node:8.11.3@sha256:f1063d6b0e8b919e25aad49f1ca3d446f5114f8a33881a45f10058abaa3dca64
     working_directory: ~/repo
     steps:
       - checkout
@@ -23,7 +23,7 @@ jobs:
             - ./*
   deploy_dev:
     docker:
-      - image: circleci/node:8.11.3@sha256:339b91052ff2f433453a963138fceb39edad08ec6398f17aaa91c34b9cf775ba
+      - image: circleci/node:8.11.3@sha256:f1063d6b0e8b919e25aad49f1ca3d446f5114f8a33881a45f10058abaa3dca64
     working_directory: ~/repo
     steps:
       - attach_workspace: