Use LTS version of Node instead of hardcoded 20

Author: gomander

.github/workflows/firebase-hosting-push.yml

@@ -21,10 +21,10 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-      - name: Install Node.js 20
+      - name: Install Node
         uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: lts/*
       - name: Install pnpm and dependencies
         uses: pnpm/action-setup@v4
         with: