update release notes

Author: K-Tone

Packages/com.unity.inputsystem/CHANGELOG.md

@@ -24,6 +24,7 @@ however, it has to be formatted properly to pass verification tests.
 - Fixed an issue in `RebindingUISample` preventing UI navigation without Keyboard and Mouse present.
 - Fixed an issue in `RebindActionUI` which resulted in active binding not being shown after a scene reload. ISXB-1588.
 - Fixed an issue in `GamepadIconExample` which resulted in icons for left and right triggers not being displayed after a rebind to the exact same controls. ISXB-1593.
+- Fixed the compilation warnings when used with Unity 6.4 (ISX-2349)
 - Fixed an issue where `InputSystemUIInputModule.localMultiPlayerRoot` could not be set to `null` when using `MultiplayerEventSystem`. [ISXB-1610](https://issuetracker.unity3d.com/product/unity/issues/guid/ISXB-1610)
 
 ## [1.14.2] - 2025-08-05