build(deps): bump github.com/rootless-containers/rootlesskit

Bumps [github.com/rootless-containers/rootlesskit](https://github.com/rootless-containers/rootlesskit) from 0.9.3 to 0.9.4.
- [Release notes](https://github.com/rootless-containers/rootlesskit/releases)
- [Commits](https://github.com/rootless-containers/rootlesskit/compare/v0.9.3...v0.9.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
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