Fix warning handling with pytest 8.0

tests/cli/test_cli_download.py

@@ -5,6 +5,7 @@
 import pytest
 import torchvision
 from hydra.experimental import compose, initialize
+import warnings
 
 import lightly
 from tests.api_workflow.mocked_api_workflow_client import (
@@ -114,7 +115,7 @@ def test_download_from_tag_with_integer_name(self):
             f"lightly-download token='123' dataset_id='{_DATASET_ID}' tag_name=1000"
         )
         self.parse_cli_string(cli_string)
-        with pytest.warns(None) as record:
+        with warnings.catch_warnings(record=True) as record:
             lightly.cli.download_cli(self.cfg)
         # check if the warning "Tag with name 1000 does not exist" is raised
         # if so, the cli string was not parsed correctly