[ue] Update example project to UE 5.4.

spine-ue/Source/SpineUE.Target.cs

@@ -7,7 +7,7 @@ public class SpineUETarget : TargetRules
 {
 	public SpineUETarget(TargetInfo Target) : base(Target)
 	{
-		DefaultBuildSettings = BuildSettingsVersion.V2;
+		DefaultBuildSettings = BuildSettingsVersion.Latest;
 		Type = TargetType.Game;
 		ExtraModuleNames.AddRange(new string[] { "SpineUE" });
 	}

spine-ue/Source/SpineUEEditor.Target.cs

@@ -4,7 +4,7 @@ public class SpineUEEditorTarget : TargetRules
 {
 	public SpineUEEditorTarget(TargetInfo target) : base(target)
 	{
-		DefaultBuildSettings = BuildSettingsVersion.V2;
+		DefaultBuildSettings = BuildSettingsVersion.Latest;
 		Type = TargetType.Editor;
 		ExtraModuleNames.AddRange(new string[] { "SpineUE" });
 	}

spine-ue/SpineUE.uproject

@@ -1,6 +1,6 @@
 {
 	"FileVersion": 3,
-	"EngineAssociation": "5.3",
+	"EngineAssociation": "5.4",
 	"Category": "",
 	"Description": "",
 	"Modules": [