test: fix tests for python <3.10

Author: jooola

tests/unit/servers/test_client.py

@@ -317,7 +317,7 @@ def test_rebuild(self, hetzner_client, bound_server, generic_action):
 
         assert response.action.id == 1
         assert response.action.progress == 0
-        assert isinstance(response.root_password, str | None)
+        assert response.root_password is None or isinstance(response.root_password, str)
 
     def test_enable_backup(self, hetzner_client, bound_server, generic_action):
         hetzner_client.request.return_value = generic_action
@@ -1049,7 +1049,7 @@ def test_rebuild(self, servers_client, server, generic_action):
 
         assert response.action.id == 1
         assert response.action.progress == 0
-        assert isinstance(response.root_password, str | None)
+        assert response.root_password is None or isinstance(response.root_password, str)
 
     def test_rebuild_return_response_deprecation(self, servers_client, generic_action):
         servers_client._client.request.return_value = generic_action