Release Notes for v4.2.9

Fixes

• Fixed 'swipe' event emission on macoS>. #19352
• Fixed tray.displayBalloon() not working with custom icon on Windows. #19529
• Fixed an issue where windows symbol files were changed in a way that was incompatible with some symbolication tools. #19502
• Fixed setting the backgroundColor property on TouchBarButton to default by assigning null after the item is constructed. #19472