ci: update node versions.

- Remove Node 14, 16, and 19.
- Add Node 20, and 21.

.github/workflows/test.yaml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x, 18.x, 19.x]
+        node-version: [18.x, 20.x, 21.x]
 
     steps:
     - uses: actions/checkout@v3