build: update ng-packagr to stable version

Author: alan-agius4

packages/schematics/angular/utility/latest-versions/package.json

@@ -11,7 +11,7 @@
     "karma-jasmine-html-reporter": "~1.7.0",
     "karma-jasmine": "~4.0.0",
     "karma": "~6.3.0",
-    "ng-packagr": "~13.0.0-next.0",
+    "ng-packagr": "^13.0.0",
     "rxjs": "~7.4.0",
     "tslib": "^2.3.0",
     "typescript": "~4.4.3",