Bump webfactory/ssh-agent from 0.9.0 to 0.9.1

Bumps [webfactory/ssh-agent](https://github.com/webfactory/ssh-agent) from 0.9.0 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](webfactory/ssh-agent@dc588b6...a6f90b1)

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

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

Author: dependabot[bot]

.github/workflows/release.yml

@@ -127,7 +127,7 @@ jobs:
           token: ${{ secrets.DOCS_PAT }}
           path: './docs'
       - name: Setup bot SSH signing key
-        uses: webfactory/ssh-agent@dc588b651fe13675774614f8e6a936a468676387 # v0.9.0
+        uses: webfactory/ssh-agent@a6f90b1f127823b31d4d4a8d96047790581349bd # v0.9.1
         env:
           HAS_SSH_PRIVATE_KEY: ${{ secrets.STEP_TRAVIS_CI_GH_PRIVATE_SIGNING_KEY != '' }}
         if: ${{ env.HAS_SSH_PRIVATE_KEY == 'true' }}