chore(deps): bump webfactory/ssh-agent from 0.8.0 to 0.9.1 (#1592)

Bumps [webfactory/ssh-agent](https://github.com/webfactory/ssh-agent) from 0.8.0 to 0.9.1.
- [Release notes](https://github.com/webfactory/ssh-agent/releases)
- [Changelog](https://github.com/webfactory/ssh-agent/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webfactory/ssh-agent/compare/v0.8.0...v0.9.1)

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

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

.github/workflows/build_stable.yml

@@ -100,7 +100,7 @@ jobs:
 
     steps:
       - name: Setup deploy key
-        uses: webfactory/ssh-agent@v0.8.0
+        uses: webfactory/ssh-agent@v0.9.1
         with:
           ssh-private-key: ${{ secrets.HELM_DEPLOY_KEY }}