chore: remove unsupported node configs from CI

No change to logic. GitHub Actions recently dropped some NodeJS
configurations from their service. This excludes those configs from our
CI.

This also adds Node versions up through v22.

Test: npm run check-node-support

.github/workflows/main.yml

@@ -25,10 +25,33 @@ jobs:
           - 18
           - 19
           - 20
+          - 21
+          - 22
         os:
           - ubuntu-latest
           - macos-latest
           - windows-latest
+        exclude:
+          - node-version: 6
+            os: macos-latest
+          - node-version: 7
+            os: macos-latest
+          - node-version: 8
+            os: macos-latest
+          - node-version: 9
+            os: macos-latest
+          - node-version: 10
+            os: macos-latest
+          - node-version: 11
+            os: macos-latest
+          - node-version: 12
+            os: macos-latest
+          - node-version: 13
+            os: macos-latest
+          - node-version: 14
+            os: macos-latest
+          - node-version: 15
+            os: macos-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2

scripts/check-node-support.js

@@ -9,7 +9,7 @@ var shell = require('shelljs');
 
 // This is the authoritative list of supported node versions.
 var MIN_NODE_VERSION = 6;
-var MAX_NODE_VERSION = 20;
+var MAX_NODE_VERSION = 22;
 
 function checkReadme(minNodeVersion) {
   var start = '<!-- start minVersion -->';