Restore configureAwait false

Author: thibault-reigner

Ix.NET/Source/System.Linq.Async/System/Linq/Operators/SkipLast.cs

@@ -47,7 +47,7 @@ static async IAsyncEnumerable<TSource> Core(IAsyncEnumerable<TSource> source, in
             {
                 var q = new Queue<TSource>();
 
-                await foreach (var x in source.WithCancellation(cancellationToken))
+                await foreach (var x in source.WithCancellation(cancellationToken).ConfigureAwait(false))
                 {
                     q.Enqueue(x);