ci: fix prepublishOnly script

Author: sapphi-red

package.json

@@ -27,7 +27,7 @@
     "test": "vitest --run",
     "prebuild": "rm -rf dist",
     "build": "node scripts/build.js && tsc -p . && rolldown -c rolldown.config.mjs",
-    "prepublishOnly": "npm build",
+    "prepublishOnly": "pnpm build",
     "lint": "oxlint",
     "format": "oxfmt"
   },