Update plugin_type_example to use PHP attributes instead of annotations

I believe the phpstan tests are failing here because 📌 Update templates so 11.0 is the default/current branch RTBC is changing the GitLab CI default major version to Drupal 11. And Tour module was removed from Drupal 11.

avpaderno → made their first commit to this issue’s fork.

Without the Tour Example module, tests are no longer failing.

Thank you for the merge request! I will merge it when I will be back to my computer, between two hours.

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