Update

Author: JamesNK

src/Http/Routing/src/RoutingMetrics.cs

@@ -1,9 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using System.Diagnostics;
 using System.Diagnostics.Metrics;
-using System.Runtime.CompilerServices;
 using Microsoft.Extensions.Diagnostics.Metrics;
 
 namespace Microsoft.AspNetCore.Routing;