Bump rake_ssh from 0.6.0 to 0.8.0

Bumps [rake_ssh](https://github.com/infrablocks/rake_ssh) from 0.6.0 to 0.8.0.
- [Release notes](https://github.com/infrablocks/rake_ssh/releases)
- [Commits](infrablocks/rake_ssh@v0.6.0...v0.8.0)

---
updated-dependencies:
- dependency-name: rake_ssh
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -1384,7 +1384,7 @@ GEM
     rake_gpg (0.16.0)
       rake_factory (>= 0.23, < 1)
       ruby_gpg2 (>= 0.6, < 1)
-    rake_ssh (0.6.0)
+    rake_ssh (0.8.0)
       colored2 (~> 3.1)
       rake_factory (~> 0.23)
       sshkey (~> 2.0)