Bump puppet-unattended_upgrades to 6.0.0
Bump puppet-unattended_upgrades to 6.0.0

SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site