Update webfactory/ssh-agent action to v0.9.1 (#4)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Setup SSH Agent
-        uses: webfactory/ssh-agent@v0.9.0
+        uses: webfactory/ssh-agent@v0.9.1
         with:
           ssh-private-key: |
             ${{ secrets.SSH_PRIVATE_KEY }}