devel/gitlab-runner: update to 18.6.0

Fixes error in pipeline:
fatal: unable to get password from user

More info:
gitlab-org/gitlab#581563
gitlab-org/gitlab-runner#39123
gitlab-org/gitlab-runner!5958

Changes:	https://gitlab.com/gitlab-org/gitlab-runner/blob/v18.6.0/CHANGELOG.md
(cherry picked from commit e79904f5)