don't import Foundation if FoundationEssentials/Dispatch available

Author: lhoward

Sources/Creators/AsyncTimerSequence.swift

@@ -5,7 +5,12 @@
 //  Created by Thibault Wittemberg on 04/03/2022.
 //
 
+#if canImport(FoundationEssentials)
+import FoundationEssentials
+import Dispatch
+#else
 @preconcurrency import Foundation
+#endif
 
 private extension DispatchTimeInterval {
   var nanoseconds: UInt64 {