Phpstan failed

Is this included in the error like this?

No! This is not for you! Your Drupal installation does not support utf8mb4. Have a fruitless look at https://www.drupal.org/docs/7/api/schema-api/data-types/encoding-collati → ... and then forget this module."

yes

Googling for that specific error message it comes up from https://www.drupal.org/forum/support/module-development-and-code-questio... → , looks like you either use that custom module or someone very strongly got inspired by that code (copy-pasted it). This would be output when that code is run (since it echos and dies). The container in this case is not yet initiatialized because the error happens in a global context while the codebase is being assembled. Look at your own site codebase to find this code.

Thank you very much.
I found it in the wayback filer module → .
I will move the issue there.

There seems to be an incomplete install routine (in \wayback_filter\wayback_filter.install) that causes errors when running upgrade_status.
Why do you need this routine?
Was it copied from somewhere and forgotten or does it fullfill a purpose?