Fix update test

Problem/Motivation

In 🐛 \Drupal::$container is not initialized yet Fixed , we created a new test which programmatically executes the update.php to make sure, this module doesn't break updates (as we ran into that issue).

Unfortunately, the path to the db dump used in the test only resolves locally to the dump from core/system, but not in the GitLab CI instance.

In the method "setDatabaseDumpFiles" we do not have access to any \Drupal:: calls.

Steps to reproduce

Proposed resolution

Fix the path if possible.

Remaining tasks

User interface changes

API changes

Data model changes