upgrade node

Author: hipstersmoothie

.github/workflows/push.yml

@@ -38,10 +38,10 @@ jobs:
       - name: Prepare repository
         run: git fetch --unshallow --tags
 
-      - name: Use Node.js 12.x
+      - name: Use Node.js 20.x
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: 20.x
 
       - name: Create Release
         env: