🧹: apply all @dependabot's suggested security updates.

[robshakir]

 * (M) go.{mod,sum}
  - Update all packages that @dependabot suggests we update.

[coveralls]

coverage: 88.807%. remained the same
when pulling 954e4d3 on update-v-d
into fd57413 on master.

[robshakir]

Thanks for the review. :-)