fix version of @angular-devkit/build-angular

Author: manfredsteyer

package.json

@@ -35,7 +35,7 @@
     "zone.js": "~0.10.2"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "0.1100.0-next.4",
+    "@angular-devkit/build-angular": "0.1100.0-next.6",
     "@angular/cli": "11.0.0-next.6",
     "@angular/compiler-cli": "11.0.0-next.6",
     "@types/jasmine": "~3.5.0",