Clean System.IO.Pipelines explicit dependency

[jairbubbles]

I got that exception during the startup of my application:

System.MissingMethodException: Method not found: 'System.Threading.Tasks.ValueTask System.IO.Pipelines.PipeWriter.CompleteAsync(System.Exception)'.

With stack trace:

   at Nerdbank.Streams.PipeExtensions.<>c__DisplayClass19_0.<<UsePipeReader>b__2>d.MoveNext() in D:\a\1\s\src\Nerdbank.Streams\PipeExtensions.cs:line 546
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[TStateMachine](TStateMachine& stateMachine) in f:\dd\ndp\clr\src\BCL\system\runtime\compilerservices\AsyncMethodBuilder.cs:line 322
   at Nerdbank.Streams.PipeExtensions.<>c__DisplayClass19_0.<UsePipeReader>b__2()
   at System.Threading.Tasks.Task`1.InnerInvoke() in f:\dd\ndp\clr\src\BCL\system\threading\Tasks\Future.cs:line 680
   at System.Threading.Tasks.Task.Execute() in f:\dd\ndp\clr\src\BCL\system\threading\Tasks\Task.cs:line 2498

I don't completely understand why I get this but the dependency tree is a bit complex so I feel like simplifying would improve the situation. System.IO.Pipelines is inherited by dependency to NerdBank.Streams so we should not explictely reference it.

[codecov]

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