fixes in conftest urls

Author: geetu040

tests/conftest.py

@@ -273,11 +273,11 @@ def as_robot() -> Iterator[None]:
 @pytest.fixture(autouse=True)
 def with_server(request):
     if "production_server" in request.keywords:
-        openml.config.server = "https://www.openml.org/api/v1/xml"
+        openml.config.server = "https://www.openml.org/api/v1/xml/"
         openml.config.apikey = None
         yield
         return
-    openml.config.server = f"{openml.config.TEST_SERVER_URL}/api/v1/xml"
+    openml.config.server = f"{openml.config.TEST_SERVER_URL}/api/v1/xml/"
     openml.config.apikey = TestBase.user_key
     yield