Use AsEnumerable for UserManager.Users

Jellyfin.Server.Implementations/Users/UserManager.cs

@@ -96,7 +96,7 @@ namespace Jellyfin.Server.Implementations.Users
                     .Include(user => user.Preferences)
                     .Include(user => user.AccessSchedules)
                     .Include(user => user.ProfileImage)
-                    .ToList();
+                    .AsEnumerable();
             }
         }