[blacksmith] Bump version to 1.5.1
[blacksmith] Bump version to 1.5.1

Bauer-Xcel-Media/puppet-gitlab,vshn/puppet-gitlab,poikilotherm/puppet-gitlab,poikilotherm/puppet-gitlab,Bigluu/puppet-gitlab,icann-dns/puppet-gitlab,icann-dns/puppet-gitlab,Bigluu/puppet-gitlab,vshn/puppet-gitlab,Bauer-Xcel-Media/puppet-gitlab