chore: remove unused vitest-polly devDependency

Author: roll

package.json

@@ -60,7 +60,6 @@
     "tempy": "3.2.0",
     "vite": "^8.0.10",
     "vite-plus": "0.1.19",
-    "vitest-polly": "2.1.0",
     "wrangler": "4.85.0"
   },
   "engines": {