bump node version to 20 (#90)

Author: njzjz

.github/workflows/push.yml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v2
       with:
-        node-version: 14
+        node-version: 20
     - run: npm install -g yarn
     - name: Get yarn cache
       id: yarn-cache