chore(deps): update devdependency knip to v6 (#141)

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

Author: renovate[bot]

package.json

@@ -43,7 +43,7 @@
     "changelogithub": "14.0.0",
     "eslint": "9.39.2",
     "installed-check": "9.3.0",
-    "knip": "5.68.0",
+    "knip": "6.14.2",
     "lint-staged": "16.2.6",
     "simple-git-hooks": "2.13.1",
     "typescript": "5.9.3",