build(deps): bump update-ssh-keys from 0.6.0 to 0.6.1
build(deps): bump update-ssh-keys from 0.6.0 to 0.6.1

Bumps [update-ssh-keys](https://github.com/coreos/update-ssh-keys) from 0.6.0 to 0.6.1.
- [Release notes](https://github.com/coreos/update-ssh-keys/releases)
- [Commits](https://github.com/coreos/update-ssh-keys/compare/v0.6.0...v0.6.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
coreos/coreos-metadata