chore: use node version >=14 in CI

Author: dziraf

.github/workflows/push.yml

@@ -10,7 +10,7 @@ jobs:
       - name: Setup
         uses: actions/setup-node@v1
         with:
-          node-version: '10.x'
+          node-version: '14'
       - uses: actions/cache@v1
         id: yarn-cache
         with: