Bump the ssh-agent version for actions to 0.9.0

Author: danakj

.github/workflows/subdoc.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           submodules: 'true'
 
-      - uses: webfactory/ssh-agent@v0.7.0
+      - uses: webfactory/ssh-agent@v0.9.0
         with:
           ssh-private-key: ${{ secrets.DOCS_SSH_PRIVATE_KEY }}