We no longer use the IMemoryCache from DI

src/Microsoft.AspNetCore.ResponseCaching/ResponseCachingServicesExtensions.cs

@@ -25,7 +25,6 @@ namespace Microsoft.Extensions.DependencyInjection
                 throw new ArgumentNullException(nameof(services));
             }
 
-            services.AddMemoryCache();
             services.TryAdd(ServiceDescriptor.Singleton<IResponseCachingPolicyProvider, ResponseCachingPolicyProvider>());
             services.TryAdd(ServiceDescriptor.Singleton<IResponseCachingKeyProvider, ResponseCachingKeyProvider>());