`AnyObject`-constrained `withLatestFrom` overload

class_with_latest_from.swift

extension Publisher where Self: AnyObject {
	func withLatestFrom<Other: Publisher>(
		_ other: Other
	) -> AnyPublisher<Other.Output, Other.Failure>
	where Failure == Other.Failure {
		other
			.map { [weak self] second in
				self?.map { _ in second }.eraseToAnyPublisher() ??
					Empty().eraseToAnyPublisher()
			}
			.switchToLatest()
			.eraseToAnyPublisher()
	}
}