Update webfactory/ssh-agent action to v0.9.1

Author: renovate[bot]

action.yml

@@ -16,7 +16,7 @@ inputs:
 runs:
   using: composite
   steps:
-    - uses: webfactory/ssh-agent@v0.9.0
+    - uses: webfactory/ssh-agent@v0.9.1
       with:
         ssh-private-key: ${{ inputs.private-key }}