Only test on node 16

What Sass can do is independent of Node version

.github/workflows/test.yml

@@ -14,17 +14,12 @@ jobs:
 
  runs-on: ubuntu-latest
 
- strategy:
- matrix:
- node-version: [12.x, 14.x, 16.x]
- # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
-
  steps:
  - uses: actions/checkout@v3
- - name: Use Node.js ${{ matrix.node-version }}
+ - name: Use Node.js 16.x
  uses: actions/setup-node@v3
  with:
- node-version: ${{ matrix.node-version }}
+ node-version: 16.x
  cache: 'npm'
  - run: npm ci
  - run: npm test