update haxe.display for isAbstract (#9720)

std/haxe/display/Display.hx

@@ -247,6 +247,7 @@ typedef DisplayModuleType = {
 	var doc:JsonDoc;
 	var isExtern:Bool;
 	var isFinal:Bool;
+	var isAbstract:Bool;
 	var kind:DisplayModuleTypeKind;
 }
 

std/haxe/display/JsonModuleTypes.hx

@@ -250,6 +250,7 @@ typedef JsonClassField = {
 	var type:JsonType<Dynamic>;
 	var isPublic:Bool;
 	var isFinal:Bool;
+	var isAbstract:Bool;
 	var params:JsonTypeParameters;
 	var meta:JsonMetadata;
 	var kind:JsonFieldKind<Dynamic>;
@@ -301,6 +302,7 @@ typedef JsonClass = {
 	var isInterface:Bool;
 	var isExtern:Bool;
 	var isFinal:Bool;
+	var isAbstract:Bool;
 	var superClass:Null<JsonTypePathWithParams>;
 	var interfaces:Array<JsonTypePathWithParams>;
 	var fields:JsonClassFields;