rust/keygen(deps): bump clap from 4.5.49 to 4.5.50 in /tools/ssh_keygen

Bumps [clap](https://github.com/clap-rs/clap) from 4.5.49 to 4.5.50.
- [Release notes](https://github.com/clap-rs/clap/releases)
- [Changelog](https://github.com/clap-rs/clap/blob/master/CHANGELOG.md)
- [Commits](clap-rs/clap@clap_complete-v4.5.49...clap_complete-v4.5.50)

---
updated-dependencies:
- dependency-name: clap
  dependency-version: 4.5.50
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]