Missed some changes from unloaded projects

Author: ramonsmits

src/NServiceBus.AcceptanceTesting/AcceptanceTestingPersistence/AcceptanceTestingSynchronizedStorageSession.cs

@@ -13,7 +13,11 @@ class AcceptanceTestingSynchronizedStorageSession : ICompletableSynchronizedStor
 {
     public AcceptanceTestingTransaction Transaction { get; private set; }
 
-    public void Dispose() => Transaction = null;
+    public ValueTask DisposeAsync()
+    {
+        Transaction = null;
+        return ValueTask.CompletedTask;
+    }
 
     public ValueTask<bool> TryOpen(IOutboxTransaction transaction, ContextBag context,
         CancellationToken cancellationToken = default)

src/NServiceBus.AcceptanceTests/Core/Reliability/SynchronizedStorage/When_opening_storage_session_outside_pipeline.cs

@@ -85,7 +85,7 @@ public MyTask(Context scenarioContext, IServiceProvider provider)
                 protected override async Task OnStart(IMessageSession session, CancellationToken cancellationToken = default)
                 {
                     using (var scope = provider.CreateScope())
-                    using (var completableSynchronizedStorageSession =
+                    await using (var completableSynchronizedStorageSession =
                            scope.ServiceProvider.GetRequiredService<ICompletableSynchronizedStorageSession>())
                     {
                         await completableSynchronizedStorageSession.Open(new ContextBag(), cancellationToken);

src/NServiceBus.Core.Tests/Fakes/FakeSynchronizedStorageSession.cs

@@ -9,7 +9,7 @@
 using Outbox;
 using Transport;
 
-public class FakeSynchronizedStorageSession : ICompletableSynchronizedStorageSession
+public sealed class FakeSynchronizedStorageSession : ICompletableSynchronizedStorageSession
 {
     public FakeSynchronizedStorageSession(FakeTransaction transaction)
     {
@@ -58,10 +58,10 @@ public Task Open(ContextBag context, CancellationToken cancellationToken = defau
         return Task.CompletedTask;
     }
 
-    public void Dispose()
+    public ValueTask DisposeAsync()
     {
         Transaction = null;
-        GC.SuppressFinalize(this);
+        return ValueTask.CompletedTask;
     }
 
     public Task CompleteAsync(CancellationToken cancellationToken = default)