test: use AUTH_COOKIE_NAME constant in auth test

Author: touale

tests/driver/test_auth.py

@@ -183,7 +183,7 @@ async def test_oauth_callback_success(self):
             res = await oauth_callback(code="abc")
             assert res.status_code == status.HTTP_302_FOUND
             assert res.headers["location"] == DOCS_URL
-            assert "token=" in res.headers.get("set-cookie", "")
+            assert f"{AUTH_COOKIE_NAME}=" in res.headers.get("set-cookie", "")
 
 
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