fix: Change BookingSystem.AspNetCore.Helpers to BookingSystem.AspNetFramework.Helpers

Author: Reikyo

Examples/BookingSystem.AspNetFramework/Feeds/FacilitiesFeeds.cs

@@ -1,5 +1,5 @@
 using Bogus;
-using BookingSystem.AspNetCore.Helpers;
+using BookingSystem.AspNetFramework.Helpers;
 using OpenActive.DatasetSite.NET;
 using OpenActive.FakeDatabase.NET;
 using OpenActive.NET;