Use ConnectAsync in MimeKitEmailSender for async SMTP connection (#837)

Author: samanazadi1996

src/Clean.Architecture.Infrastructure/Data/Queries/FakeListContributorsQueryService.cs

@@ -7,10 +7,10 @@ public class FakeListContributorsQueryService : IListContributorsQueryService
 {
   public Task<IEnumerable<ContributorDTO>> ListAsync()
   {
-    List<ContributorDTO> result =
+    IEnumerable<ContributorDTO> result =
         [new ContributorDTO(1, "Fake Contributor 1", ""),
         new ContributorDTO(2, "Fake Contributor 2", "")];
 
-    return Task.FromResult(result.AsEnumerable());
+    return Task.FromResult(result);
   }
 }

src/Clean.Architecture.Infrastructure/Email/MimeKitEmailSender.cs

@@ -17,7 +17,7 @@ public async Task SendEmailAsync(string to, string from, string subject, string
     _logger.LogWarning("Sending email to {to} from {from} with subject {subject} using {type}.", to, from, subject, this.ToString());
 
     using var client = new SmtpClient(); 
-    client.Connect(_mailserverConfiguration.Hostname, 
+    await client.ConnectAsync(_mailserverConfiguration.Hostname, 
       _mailserverConfiguration.Port, false);
     var message = new MimeMessage();
     message.From.Add(new MailboxAddress(from, from));