chore(deps): update devdependency knip to v6 (#1259)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "changelogen": "^0.6.2",
     "eslint": "^10.1.0",
     "exsolve": "^1.0.8",
-    "knip": "^5.88.1",
+    "knip": "^6.2.0",
     "nuxt": "^4.4.2",
     "pkg-pr-new": "^0.0.66",
     "semver": "^7.7.4",