Bump github.com/gliderlabs/ssh from 0.3.6 to 0.3.7

Bumps [github.com/gliderlabs/ssh](https://github.com/gliderlabs/ssh) from 0.3.6 to 0.3.7.
- [Release notes](https://github.com/gliderlabs/ssh/releases)
- [Commits](https://github.com/gliderlabs/ssh/compare/v0.3.6...v0.3.7

)

---
updated-dependencies:
- dependency-name: github.com/gliderlabs/ssh
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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