Missed namespace in another file

Author: andyfelton-equatedigital

tests/ImageSharp.Web.Tests/TestUtilities/PhysicalFileSystemCacheTestServerFixture.cs

@@ -9,6 +9,7 @@
 using SixLabors.ImageSharp.Web.DependencyInjection;
 using SixLabors.ImageSharp.Web.Middleware;
 using SixLabors.ImageSharp.Web.Providers;
+using SixLabors.ImageSharp.Web.Providers.AWS;
 using SixLabors.ImageSharp.Web.Providers.Azure;
 using Xunit;