Removed unecessary using in associated test

Author: benhopkinstech

src/Framework/AspNetCoreAnalyzers/test/RouteHandlers/DisallowNonParsableComplexTypesOnParametersTest.cs

@@ -1,7 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using System.Security.Policy;
 using Microsoft.CodeAnalysis.Testing;
 using VerifyCS = Microsoft.AspNetCore.Analyzers.Verifiers.CSharpAnalyzerVerifier<Microsoft.AspNetCore.Analyzers.RouteHandlers.RouteHandlerAnalyzer>;