devel/gitlab-runner: update to 18.6.1

This release includes the patch, so removed it.

Changes: https://gitlab.com/gitlab-org/gitlab-runner/-/compare/v18.6.0...v18.6.1?from_project_id=250833
(cherry picked from commit d335d58e247a5829f8a7896e3fdc2a3bc5ed9178)