Yeah, I don't know what a DynamicSpineBone is. I don't think that's existed in a while.
Since it's in examples though, you could get rid of it and everything will work. Unless you're using it.
In which case, the error just says the delegate signature has changed from MethodName(SkeletonRenderer) to MethodName(ISkeletonAnimation).
So if you have anything that's subscribing to it, you should change the method signature there.
In this case, you should change DynamicSpineBone.UpdateLocal's parameter's type from