Bump sshpk from 1.10.1 to 1.16.1

Bumps [sshpk](https://github.com/joyent/node-sshpk) from 1.10.1 to 1.16.1.
- [Release notes](https://github.com/joyent/node-sshpk/releases)
- [Commits](https://github.com/joyent/node-sshpk/commits/v1.16.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]