Add permission to allow GET required_status_checks, linked to #2310

[daconstenla]

As described over the issue #2310 it seems like the permission required to check required_status_checks endpoint is allowed under the scope of administration > branches, check github docs: permissions-required-for-github-apps#permission-on-administration.

[GET /repos/:owner/:repo/branches/:branch/protection/required_status_checks](https://docs.github.com/en/rest/reference/branches#get-status-checks-protection) (:read)

This pull-request adds the required extra permission to read under administration to check the desired endpoint.

[jamengual]

LGTM we can test it out on the pre-release @daconstenla