fix: do not trigger on the missing releases for 'simple' release type (#1617)
fix: do not trigger on the missing releases for 'simple' release type (#1617)

`simple` release type only updates `version.txt` and does not do anything else. Skip the check for this type.
googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots,googleapis/repo-automation-bots