devel/rubygem-google-apis-iam_v1-gitlab: update to 0.79.0
Required for gitlab 18.6
Changes: https://github.com/googleapis/google-api-ruby-client/blob/main/generated/google-apis-iam_v1/CHANGELOG.md
(cherry picked from commit 20b73160d6c019de5713c6310c0bc6dcfe4856ca)