one more pipelines reference

Author: david-driscoll

benchmarks/Pipeline/Pipeline.csproj

@@ -8,7 +8,6 @@
 
     <ItemGroup>
         <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
-        <PackageReference Include="System.IO.Pipelines" Version="4.7.3" />
         <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
         <PackageReference Include="Nerdbank.Streams" Version="2.6.81" />
     </ItemGroup>