add missing comma in array

Jellyfin.Server/Migrations/MigrationRunner.cs

@@ -20,7 +20,7 @@ namespace Jellyfin.Server.Migrations
             typeof(Routines.CreateUserLoggingConfigFile),
             typeof(Routines.MigrateActivityLogDb),
             typeof(Routines.RemoveDuplicateExtras),
-            typeof(Routines.AddDefaultPluginRepository)
+            typeof(Routines.AddDefaultPluginRepository),
             typeof(Routines.MigrateUserDb)
         };