chore(deps): update dependency ng-packagr to v21

Author: renovate[bot]

package.json

@@ -54,7 +54,7 @@
     "karma-coverage": "~2.2.0",
     "karma-jasmine": "~5.1.0",
     "karma-jasmine-html-reporter": "~2.1.0",
-    "ng-packagr": "^20.1.0",
+    "ng-packagr": "^21.0.0",
     "semantic-release": "^24.0.0",
     "typescript": "~5.8.3",
     "typescript-eslint": "^8.38.0"