fix: use bun setup instead of npm

Author: toonshouin

.github/workflows/deploy.yml

@@ -36,11 +36,8 @@ jobs:
       #   with:
       #     version: 9 # Not needed if you've set "packageManager" in package.json
       # - uses: oven-sh/setup-bun@v1 # Uncomment this if you're using Bun
-      - name: Setup Node
-        uses: actions/setup-node@v6
-        with:
-          node-version: 24
-          cache: npm # or pnpm / yarn
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
       - name: Setup Pages
         uses: actions/configure-pages@v4
       - name: Install dependencies