ci: Update Node.js versions to latest supported LTS

  - Remove Node.js 16.x (EOL April 2024)
  - Test on Node.js 18.x, 20.x, 22.x (current supported versions)
  - Node.js 22.x is current LTS for Angular 15 compatibility

Author: t-ho

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [18.x, 20.x, 22.x]
 
     steps:
       - uses: actions/checkout@v4