Add missing app field to HookCheckSuite

[jfroche]

Issue reference:
I didn't make an issue as this was a TODO.
The documentation for the app in the check suite is here https://docs.github.com/en/webhooks/webhook-events-and-payloads#check_suite

Submission Checklist:

• Have you followed the guidelines in our Contributing document (for example, is your tree a clean merge)?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Does your submission build?
• Does your submission pass tests?
• Have you run lints on your code locally prior to submission?
• Have you updated all of the cabal/nix infrastructure?
• Is this a breaking change? Have you discussed this?

[kvanbere]

Hey @ashercuedo, could you please raise an issue for this and document the intended change, then edit the PR and add the issue reference. Thanks

[ashercuedo]

Looks good to me - I created issue #82 to document exactly what this PR is targeting and have merged it.

[ashercuedo]

Hey @jfroche, would you like to be added to the contributors list?

[jfroche]

Hey @jfroche, would you like to be added to the contributors list?

Yes, thank you