chore: remove unused picocolors dependency

It was used for debugging purposes, only accidentally left in the package.json.

Author: haoqunjiang

package.json

@@ -50,7 +50,6 @@
     "kleur": "^4.1.5",
     "kolorist": "^1.8.0",
     "lint-staged": "^15.2.10",
-    "picocolors": "^1.1.0",
     "prettier": "^3.3.3",
     "prompts": "^2.4.2",
     "vitest": "^2.1.2",