FIX: Address CI failure in Package validation tests (#1922)

Author: timkeo

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -10,6 +10,7 @@ however, it has to be formatted properly to pass verification tests.
 
 ## [Unreleased] - yyyy-mm-dd
 - Fixed Composite binding isn't triggered after ResetDevice() called during Action handler [ISXB-746](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-746)
+- Fixed resource designation for "d_InputControl" icon to address CI failure
 
 ## [1.8.2] - 2024-04-29
 

Packages/com.unity.inputsystem/InputSystem/Editor/UITKAssetEditor/Resources/InputActionsEditorStyles.uss

@@ -95,7 +95,7 @@
 
 .tree-view-item-icon{
     justify-content: center;
-    background-image: url("/Packages/com.unity.inputsystem/InputSystem/Editor/Icons/d_InputControl.png");
+    background-image: resource('Packages/com.unity.inputsystem/InputSystem/Editor/Icons/d_InputControl.png');
     width: 16px;
     height: 16px;
 }