Check github actions weekly with dependabot (PR #11411)

This allows dependabot to check any github action which this project uses and submit PRs with version bumps.

https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/keeping-your-actions-up-to-date-with-dependabot

GitHub

@OsamaSayegh what are your thoughts on this? Is it a good idea?

Yeah I think it’s a good idea to be alerted about new versions of the actions that we use. We can always turn it off if it proves to be troublesome.