voxpupuli-test: Pull in 5.4 or newer
voxpupuli-test: Pull in 5.4 or newer

This ensures that people testing locally have the same rubocop as our
CI. People complained in the past that CI shows issues they cannot
reproproduce. This changes forces them to run `bundle update` and will
then pull in latest rubocop.

voxpupuli/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config