klausctl release v0.0.15

What’s Changed

• Update module github.com/giantswarm/klaus-oci to v0.0.4 by @renovate[bot] in https://github.com/giantswarm/klausctl/pull/50

Full Changelog: https://github.com/giantswarm/klausctl/compare/v0.0.14...v0.0.15