chore(deps): update dependency knip to v6

Author: renovate[bot]

package.json

@@ -76,7 +76,7 @@
     "concurrently": "^9.2.1",
     "dependency-cruiser": "^17.3.6",
     "dotenv-cli": "^11.0.0",
-    "knip": "^5.79.0",
+    "knip": "^6.0.0",
     "lint-staged": "^16.2.7",
     "prisma": "^6.14.0",
     "simple-git-hooks": "^2.13.1",