Chore(deps-dev): Bump @relative-ci/agent from 4.1.6 to 4.1.8

Bumps [@relative-ci/agent](https://github.com/relative-ci/agent) from 4.1.6 to 4.1.8.
- [Release notes](https://github.com/relative-ci/agent/releases)
- [Commits](relative-ci/agent@v4.1.6...v4.1.8)

---
updated-dependencies:
- dependency-name: "@relative-ci/agent"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>