Use new Circle CI images

The old images are deprecated:
<https://discuss.circleci.com/t/legacy-convenience-image-deprecation/41034>

Author: sgravrock

.circleci/config.yml

@@ -2,33 +2,33 @@
 
 version: 2.1
 
-orbs:
-  node: circleci/[email protected]
-
 executors:
   node16:
     docker:
-      - image: cimg/node:16.1.0
+      - image: cimg/node:16.14.0 # Latest 16.x
     working_directory: ~/workspace
   node14_latest:
     docker:
-      - image: circleci/node:14
+      - image: cimg/node:14.17.4 # Latest 14.x
     working_directory: ~/workspace
+  # 14.8 is the first version with top level await in ES modules.
   node14_8:
     docker:
-      - image: circleci/node:14.8
+      - image: cimg/node:14.8
     working_directory: ~/workspace
+  # 14.7 is the last version without top level await in ES modules.
   node14_7:
     docker:
-      - image: circleci/node:14.7
+      - image: cimg/node:14.7
     working_directory: ~/workspace
   node12_latest:
     docker:
-    - image: circleci/node:12
+    - image: cimg/node:12.22.10 # Latest 12.x
     working_directory: ~/workspace
+  # 12.17 is the first version with dynamic import() of commonjs modules
   node12_17:
     docker:
-    - image: circleci/node:12.17
+    - image: cimg/node:12.17
     working_directory: ~/workspace
 
 jobs: