build(deps): bump openssh-keys from 0.6.2 to 0.6.3

Bumps [openssh-keys](https://github.com/coreos/openssh-keys) from 0.6.2 to 0.6.3.
- [Release notes](https://github.com/coreos/openssh-keys/releases)
- [Changelog](https://github.com/coreos/openssh-keys/blob/main/docs/release-notes.md)
- [Commits](coreos/openssh-keys@v0.6.2...v0.6.3)

---
updated-dependencies:
- dependency-name: openssh-keys
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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