PHP 8.4 incompatibility

[arnested]

Package containing the bug

I’m not sure

Describe the bug

The Drupal module throws some warnings about "Implicitly marking a parameter as nullable is deprecated since PHP 8.4."

Expected behavior

No warnings when using PHP 8.4

Steps to reproduce:

1. Install the module on a PHP 8.4 site
2. Observe logs and error messages for PHP warnings
3. 😢

Additional context

A fix is in #869