chore(deps): update circleci/node:8 docker digest to b8afd69

Author: renovate-bot

.circleci/config.yml

@@ -6,7 +6,7 @@ machine:
 jobs:
   build:
     docker:
-      - image: circleci/node:8@sha256:ce17868b760603afbd6487aa3b6638e6ecb706a88ac5998c211b7c5efbde6927
+      - image: circleci/node:8@sha256:b8afd692a39511825ad59010cb5f472a5eeac9d4cbea7a9bcac4a2cd77dbf2a2
       - image: mongo:3.7.9@sha256:736eec20a17eafaa988d299902fcaab521cb0ca56af4400f782576afc878d6bc
     environment:
       - NPM_CONFIG_LOGLEVEL: warn