ci: upgrade ssh-agent action to v0.4.1

Author: saitho

.github/workflows/test.yml

@@ -51,7 +51,7 @@ jobs:
     - run: pip install -r ./requirements/pip.txt
     - name: Print Ansible version
       run: ansible --version
-    - uses: webfactory/ssh-agent@v0.2.0
+    - uses: webfactory/ssh-agent@v0.4.1
       with:
         ssh-private-key: "${{ secrets.SSH_PRIVATE_KEY }}"
     - name: Setup Hetzner server