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

This reverts commit 1147d97.

Author: json-derulo

package.json

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