fix: spacing

Author: maurei

src/JsonApiDotNetCore/Hooks/Execution/RelationshipsDictionary.cs

@@ -7,15 +7,11 @@
 
 namespace JsonApiDotNetCore.Hooks
 {
-
-
-
     /// <summary>
     /// A dummy interface used internally by the hook executor.
     /// </summary>
     public interface IRelationshipsDictionary { }
 
-
     /// <summary>
     /// An interface that is implemented to expose a relationship dictionary on another class.
     /// </summary>