fix resolving context accessors

Author: pokornyd

Kontent.Ai.Delivery.Abstractions/ContentItems/ResolvingContext.cs

@@ -11,11 +11,11 @@ public class ResolvingContext
         /// <summary>
         /// Gets the content item within current resolving context
         /// </summary>
-        public required Func<string, Task<object>> GetLinkedItem { get; internal set; }
+        public required Func<string, Task<object>> GetLinkedItem { get; init; }
 
         /// <summary>
         /// Gets an instance that resolves content links in Rich text element values
         /// </summary>
-        public required IContentLinkUrlResolver ContentLinkUrlResolver { get; internal set; }
+        public required IContentLinkUrlResolver ContentLinkUrlResolver { get; init; }
     }
 }