Adds missing await on transaction

src/Web/Features/Contents/Handlers/CreateContent.cs

@@ -1,10 +1,7 @@
 using System.Collections.Concurrent;
-using Hutopy.Web.Common;
 using Hutopy.Web.Common.BlobStorage;
 using Hutopy.Web.Common.Security;
 using Hutopy.Web.Features.Contents.Data;
-using Hutopy.Web.Features.Contents.Handlers.Models;
-using Microsoft.EntityFrameworkCore;
 
 namespace Hutopy.Web.Features.Contents.Handlers;
 
@@ -69,7 +66,7 @@ public sealed class PostContent(
         var urls = new ConcurrentBag<string>();
         string? thumbnailUrl = null;
 
-        using var transaction = await context.Database.BeginTransactionAsync(ct);
+        await using var transaction = await context.Database.BeginTransactionAsync(ct);
 
         try
         {