Made TId in IResourceDefinition contravariant

Author: Bart Koelman

src/JsonApiDotNetCore/Resources/IResourceDefinition.cs

@@ -32,8 +32,7 @@ public interface IResourceDefinition<TResource> : IResourceDefinition<TResource,
     /// The resource identifier type.
     /// </typeparam>
     [PublicAPI]
-    // ReSharper disable once TypeParameterCanBeVariant -- Justification: making TId contravariant is a breaking change.
-    public interface IResourceDefinition<TResource, TId>
+    public interface IResourceDefinition<TResource, in TId>
         where TResource : class, IIdentifiable<TId>
     {
         /// <summary>