chore: use bunx for format script

Author: metonym

package.json

@@ -12,7 +12,7 @@
     "package": "bun scripts/npm-package.js",
     "test": "bun test tests/*.ts",
     "test:e2e": "playwright test",
-    "format": "prettier --write .",
+    "format": "bunx --bun prettier --write .",
     "astro": "astro",
     "playwright": "playwright"
   },