build(workflow): set node 16 in github action

Author: ph1p

.github/workflows/vercel-deploy.yml

@@ -26,8 +26,15 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     needs: test
+    strategy:
+      matrix:
+        node-version: [16.x]
     steps:
       - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
       - name: build
         run: |
           npm ci