(maint) Bump clj-parent to 4.6.3
(maint) Bump clj-parent to 4.6.3

This adds a new ssl utility function that puppetserver uses. Since it
was omitted, our integration tests were failing

puppetlabs/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb,puppetlabs/puppetdb