Bump github.com/coreos/go-systemd/v22 from 22.5.0 to 22.6.0 (#743)

Bumps [github.com/coreos/go-systemd/v22](https://github.com/coreos/go-systemd) from 22.5.0 to 22.6.0.
- [Release notes](https://github.com/coreos/go-systemd/releases)
- [Commits](https://github.com/coreos/go-systemd/compare/v22.5.0...v22.6.0)

---
updated-dependencies:
- dependency-name: github.com/coreos/go-systemd/v22
  dependency-version: 22.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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