chore(ci): Migrate circleci jobs to cimg/node docker images (mozilla#4237)

Author: rpl

.circleci/config.yml

@@ -11,21 +11,21 @@ references:
     working_directory: ~/addons-linter
     docker:
       # This is the NodeJS version we run in production.
-      - image: circleci/node:12
+      - image: cimg/node:12.22
 
   defaults-next: &defaults-next
     <<: *defaults
     docker:
       # This is the next NodeJS version we will support.
-      - image: circleci/node:14
+      - image: cimg/node:14.19
 
   defaults-alternate: &defaults-alternate
     <<: *defaults
     docker:
       # This is an alternate Node version we support or want to support in the
       # (far) future. It can either be lower or higher than the current Node
       # version we run in production.
-      - image: circleci/node:16
+      - image: cimg/node:16.14
 
   restore_build_cache: &restore_build_cache
     restore_cache: