Enabled Swift 6 on IGFitnessStickersUI

Summary: Many protocols that are conformed only by VCs needed to be marked main actor.

Reviewed By: ebgraham

Differential Revision: D74761535

fbshipit-source-id: b5d047b625df5cf16759aa5c19e5bf57594a3d99

Author: Amit Kumar

Source/IGListKit/IGListBindingSectionControllerSelectionDelegate.h

@@ -14,6 +14,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  A protocol that handles cell selection events in an `IGListBindingSectionController`.
  */
+ NS_SWIFT_UI_ACTOR
 NS_SWIFT_NAME(ListBindingSectionControllerSelectionDelegate)
 @protocol IGListBindingSectionControllerSelectionDelegate <NSObject>