chore(ci): use bun

.github/workflows/deploy.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install, build, and upload your site
         uses: withastro/action@v2
         with:
-          package-manager: pnpm@latest
+          package-manager: bun@latest
         # with:
           # path: . # The root location of your Astro project inside the repository. (optional)
           # node-version: 20 # The specific version of Node that should be used to build your site. Defaults to 20. (optional)