chore(deps): update devdependency knip to v6

Author: renovate[bot]

package.json

@@ -72,7 +72,7 @@
     "changelogen": "^0.6.2",
     "eslint": "^9.39.2",
     "installed-check": "^9.3.0",
-    "knip": "^5.82.1",
+    "knip": "^6.2.0",
     "nuxt": "^4.2.2",
     "ofetch": "^1.5.1",
     "pkg-pr-new": "^0.0.62",