Fixes namespace typo

Author: waldekmastykarz

m365-developer-proxy-plugins/Behavior/RateLimitingCustomResponseLoader.cs

@@ -2,7 +2,7 @@
 // Licensed under the MIT License.
 
 using Microsoft365.DeveloperProxy.Abstractions;
-using Microsoft365.DeveloperProxy.Plugins.MocksResponses;
+using Microsoft365.DeveloperProxy.Plugins.MockResponses;
 using System.Text.Json;
 
 namespace Microsoft365.DeveloperProxy.Plugins.Behavior;

m365-developer-proxy-plugins/Behavior/RateLimitingPlugin.cs

@@ -3,7 +3,7 @@
 
 using Microsoft.Extensions.Configuration;
 using Microsoft365.DeveloperProxy.Abstractions;
-using Microsoft365.DeveloperProxy.Plugins.MocksResponses;
+using Microsoft365.DeveloperProxy.Plugins.MockResponses;
 using System.Net;
 using System.Text.Json;
 using System.Text.RegularExpressions;