Fix phpstan issue

I assigned the task myself because I plan to fix this issue and make a Merge Request.
Please do not work on this issue.

Before Merging please have someone test if everything works the same as before! Because I haven't tested it yet. Thank you!

Thanks for the report, indeed the ContainerAwareInterface has to be removed for the Drupal 11 support.
I'm going to take this ahead and test it for merging.

Thanks for the patch, I've adapted it for Drupal 11.
It will be published in the next release after some more testing.

renrhaf → closed merge request !10

Automatically closed - issue fixed for 2 weeks with no activity.