update node version to 16

Author: jahn96

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Install node
       uses: actions/setup-node@v2
       with:
-       node-version: '14.x'
+       node-version: '16.x'
     - name: Install Python
       uses: actions/setup-python@v2
       with: