Revert "Revert "update github action node version from 12 to 16""

This reverts commit eaae559.

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: 16.x
       - name: install dependencies
         run: yarn install --frozen-lockfile --non-interactive
       - name: build