Bump webfactory/ssh-agent from 0.8.0 to 0.9.0 (#688)

Bumps [webfactory/ssh-agent](https://github.com/webfactory/ssh-agent) from 0.8.0 to 0.9.0.
- [Release notes](https://github.com/webfactory/ssh-agent/releases)
- [Changelog](https://github.com/webfactory/ssh-agent/blob/master/CHANGELOG.md)
- [Commits](webfactory/ssh-agent@v0.8.0...v0.9.0)

---
updated-dependencies:
- dependency-name: webfactory/ssh-agent
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/documentation.yml

@@ -34,7 +34,7 @@ jobs:
       - uses: actions/[email protected]
         with:
           node-version: '16.x'
-      - uses: webfactory/ssh-agent@v0.8.0
+      - uses: webfactory/ssh-agent@v0.9.0
         with:
           ssh-private-key: ${{ secrets.GH_PAGES_DEPLOY }}
       - name: Release to GitHub Pages