(maint) bump version for 4.2.1
(maint) bump version for 4.2.1

puppetlabs/puppetdb,senior/puppetdb,senior/puppetdb,mullr/puppetdb,senior/puppetdb,senior/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,rbrw/puppetdb,rbrw/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,waynr/puppetdb,mullr/puppetdb,puppetlabs/puppetdb,waynr/puppetdb,waynr/puppetdb,rbrw/puppetdb,rbrw/puppetdb,mullr/puppetdb,waynr/puppetdb,mullr/puppetdb,rbrw/puppetdb