Deprecated function: Return type of SendinBlue\Client\Model\CreateContact::offsetExists($offset)

[jtphelan]

I'm using this with the Drupal 9 SendinBlue module and I'm getting this error message about a deprecated function when I update the user. Still seems to be working.
Deprecated function: Return type of SendinBlue\Client\Model\CreateContact::offsetExists($offset) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in include() (line 43 of /app/vendor/sendinblue/api-v3-sdk/lib/Model/CreateContact.php).