feat(api): bump Dear ImGui from 1.87 to 1.88 (#309)

imgui-binding/src/main/java/imgui/internal/ImGui.java

@@ -127,10 +127,10 @@ public final class ImGui extends imgui.ImGui {
     // Init
 
     @BindingMethod
-    public static native void Initialize(ImGuiContext context);
+    public static native void Initialize();
 
     @BindingMethod
-    public static native void Shutdown(ImGuiContext context);
+    public static native void Shutdown();
 
     // NewFrame