Update dependency @casl/ability to v6

Author: renovate[bot]

package.json

@@ -45,7 +45,7 @@
     "test:watch:backend": "onchange -i -k '**/*.{js,json,yml}' -- npm run test:nowatch:backend"
   },
   "dependencies": {
-    "@casl/ability": "^5.4.3",
+    "@casl/ability": "^6.0.0",
     "@hapi/bourne": "^3.0.0",
     "@passport-next/passport": "^3.1.0",
     "ajv": "^8.6.3",