Upgrade to deprecation changes in NServiceBus.RabbitMQ 11.1.0 (#5383)

Co-authored-by: Daniel Marbach <danielmarbach@users.noreply.github.com>

Author: danielmarbach

src/Directory.Packages.props

@@ -44,7 +44,7 @@
     <PackageVersion Include="NServiceBus.Metrics" Version="6.0.0" />
     <PackageVersion Include="NServiceBus.Metrics.ServiceControl" Version="6.0.0" />
     <PackageVersion Include="NServiceBus.Persistence.NonDurable" Version="3.0.0" />
-    <PackageVersion Include="NServiceBus.RabbitMQ" Version="11.0.0" />
+    <PackageVersion Include="NServiceBus.RabbitMQ" Version="11.1.0" />
     <PackageVersion Include="NServiceBus.SagaAudit" Version="6.0.0" />
     <PackageVersion Include="NServiceBus.Testing" Version="10.0.1" />
     <PackageVersion Include="NServiceBus.Transport.AzureServiceBus" Version="6.1.0" />

src/ServiceControl.Transports.RabbitMQ/RabbitMQTransportExtensions.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using System.Data.Common;
 using System.Linq;
+using global::RabbitMQ.Client;
 using NServiceBus;
 
 static class RabbitMQTransportExtensions
@@ -40,7 +41,7 @@ public static void ApplySettingsFromConnectionString(this RabbitMQTransport tran
         if (dictionary.TryGetValue("UseExternalAuthMechanism", out var useExternalAuthMechanismString))
         {
             _ = bool.TryParse(useExternalAuthMechanismString, out var useExternalAuthMechanism);
-            transport.UseExternalAuthMechanism = useExternalAuthMechanism;
+            transport.AuthMechanisms = [new ExternalMechanismFactory()];
         }
     }
 }