PHP Deprecated: Method SplObjectStorage::attach() is deprecated since 8.5, use method SplObjectStorage::offsetSet()

[mattiacoll]

In PHP 8.5

• SplObjectStorage::attach()
• SplObjectStorage::contains()
• SplObjectStorage::detach()
  have been deprecated and should be replaced by:
• SplObjectStorage::offsetSet()
• SplObjectStorage::offsetExists()
• SplObjectStorage::offsetUnset()
  respectively. (PHP reference)

These classes seem to only be present in Container and get called just a couple of times so updating the methods should be straightforward.