build(deps): update dependency @nguniversal/builders to v15

Author: angular-robot

package.json

@@ -277,7 +277,7 @@
     "@angular/cli": "github:angular/cli-builds#1d1a6a8266061bbf3d2942dffe5772301719a517",
     "@angular/compiler-cli": "github:angular/compiler-cli-builds#f2898b7626baf6a5a12c5238ab3a23a5d639887f",
     "@angular/language-service": "github:angular/language-service-builds#1c4137eabc9b0f57735d34f6724fc616c6f5f1aa",
-    "@nguniversal/builders": "14.2.2",
+    "@nguniversal/builders": "15.0.0",
     "@types/ckeditor": "4.9.10",
     "@types/datatables.net": "1.10.24",
     "@types/express": "4.17.15",