Work around missing Application#make_nofitier method in flake8
Flake8 removed the Application#make_notifier
method in https://gitlab.com/pycqa/flake8/merge_requests/274 causing ament_lint
to fail (https://github.com/ament/ament_lint/pull/124). This change just pins flake8
to an earlier version until we migrate to ROS2 D or until a new version of ament_lint
is released for Crystal and we migrate to it.
See https://gitlab.com/AutowareAuto/AutowareAuto/-/jobs/169211258 for an example of our builds failing because of the removal of Application#make_notifier
Here's a CI build with the patch from this merge request applied https://gitlab.com/AutowareAuto/AutowareAuto/pipelines/49691648
Edited by Esteve Fernandez