chore(deps): update dependency angular-eslint to v21

Author: renovate[bot]

package.json

@@ -19,7 +19,7 @@
     "@angular/core": "^21.0.1",
     "@eslint/js": "^9.39.1",
     "@types/node": "^24.10.1",
-    "angular-eslint": "^20.7.0",
+    "angular-eslint": "^21.0.0",
     "eslint": "^9.39.1",
     "globals": "^16.5.0",
     "prettier": "~3.6.2",