Update gitlab-org/gitlab-exporter to 11.18.0
Update gitlab-org/gitlab-exporter to 11.18.0

Bump gitlab-org/gitlab-exporter from 11.17.1 to 11.18.0

Changelog: changed

Signed-off-by: Robert Marshall <0465b3b4f3ae0103ad50d09ff86a3523700a2979@gitlab.com>

gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab,gitlabhq/omnibus-gitlab