build using node 14 in CI

Author: lobsterkatie

.github/workflows/build.yml

@@ -74,6 +74,8 @@ jobs:
           ref: ${{ env.HEAD_COMMIT }}
       - name: Set up Node
         uses: actions/setup-node@v1
+        with:
+          node-version: '14'
       - name: Check dependency cache
         uses: actions/cache@v2
         with: