docs: link to homebrew-cask autobump workflow (#1391)

Author: setchy

CONTRIBUTING.md

@@ -66,7 +66,7 @@ The release process is automated. Follow the steps below.
    * due date: date of release
    * close milestone
 9. Create a [New Milestone][github-new-milestone] for upcoming release.
-10. A new homebrew cask will be automatically published (workflow runs ~3 hours)
+10. A new homebrew cask will be [automatically published][homebrew-cask-autobump-workflow] (workflow runs ~3 hours)
 
 ### Project Philosophy
 
@@ -88,5 +88,6 @@ This project is a tool for monitoring new notifications from Github. It's not me
 [github-milestones]: https://github.com/gitify-app/gitify/milestones
 [github-new-milestone]: https://github.com/gitify-app/gitify/milestones/new
 [github-new-release]: https://github.com/gitify-app/gitify/releases/new
+[homebrew-cask-autobump-workflow]: https://github.com/Homebrew/homebrew-cask/actions/workflows/autobump.yml
 [jest-website]: https://jestjs.io/