chore(deps): update dependency tsup to 8.5.1

Author: github-actions[bot]

packages/tsup-plugin/package.json

@@ -52,6 +52,6 @@
     "@stacksjs/dtsx": "workspace:*"
   },
   "peerDependencies": {
-    "tsup": "^6.0.0 || ^7.0.0 || ^8.0.0"
+    "tsup": "^8.5.1"
   }
 }