Update npm-grunt.yml

Author: wmurphysnyk

.github/workflows/npm-grunt.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [18.x, 20.x, 22.x]
+        node-version: [16.x]
 
     steps:
     - uses: actions/checkout@v4