Update build workflow

Author: PKief

.github/workflows/build.yml

@@ -8,15 +8,15 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest]
-        node-version: [12.x, 14.x]
+        node-version: [16.x]
 
     name: ${{ matrix.os }} (Node.js ${{ matrix.node-version }})
 
     steps:
       - name: Checkout 🛎
         uses: actions/checkout@v2
       - name: Setup Node.js ${{ matrix.node-version }} ⚙
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
       - name: Run display server 🖥
@@ -42,4 +42,4 @@ jobs:
           npm test
           npm run vscode:prepublish
         env:
-          DISPLAY: ":99.0"
+          DISPLAY: ':99.0'