WIP fix(challenge): fix hint requirements invalid default value

provider/challenge/hint_subresource.go

@@ -48,9 +48,9 @@ func HintSubresourceAttributes() map[string]schema.Attribute {
 		"requirements": schema.ListAttribute{
 			MarkdownDescription: "Other hints required to be consumed before getting this one. Useful for cost-increasing hint strategies with more and more help.",
 			ElementType:         types.StringType,
-			Default:             listdefault.StaticValue(basetypes.ListValue{}),
 			Computed:            true,
 			Optional:            true,
+			Default:             listdefault.StaticValue(basetypes.NewListNull(types.StringType)),
 		},
 	}
 }