fix(Papercut): Pin version 7.0 and set new HTTP and SMTP ports (#1549)

Author: HofmeisterAn

src/Testcontainers.Papercut/PapercutBuilder.cs

@@ -4,11 +4,11 @@ namespace Testcontainers.Papercut;
 [PublicAPI]
 public sealed class PapercutBuilder : ContainerBuilder<PapercutBuilder, PapercutContainer, PapercutConfiguration>
 {
-    public const string PapercutImage = "changemakerstudiosus/papercut-smtp:latest";
+    public const string PapercutImage = "changemakerstudiosus/papercut-smtp:7.0";
 
-    public const ushort SmtpPort = 25;
+    public const ushort SmtpPort = 2525;
 
-    public const ushort HttpPort = 80;
+    public const ushort HttpPort = 8080;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="PapercutBuilder" /> class.