Enable Recently Updated Check (#530)

This PR enables a new PR check, `Recently Updated`, that is intended to be used alongside GitHub Actions.

Details on this check can be found here: https://docs.rapids.ai/resources/recently-updated/.

**Note:** The new `Recently Updated` check won't appear on PRs until _after_ this change is merged to the default branch.

Authors:
  - AJ Schmidt (https://github.com/ajschmidt8)

Approvers:
  - Ray Douglass (https://github.com/raydouglass)

URL: #530

.github/ops-bot.yaml

@@ -7,3 +7,4 @@ label_checker: true
 release_drafter: true
 external_contributors: false
 copy_prs: true
+recently_updated: true