Correct LinkerFlags namespace.

Author: ilonatommy

src/Components/Components/src/Routing/Router.cs

@@ -3,7 +3,7 @@
 
 #nullable disable warnings
 
-using System.Diagnostics.CodeAnalysis;
+using Microsoft.AspNetCore.Internal;;
 using System.Reflection;
 using System.Reflection.Metadata;
 using System.Runtime.ExceptionServices;