[Bug]: Streaming capability check uses deprecated task/resubscribe method

### What happened?

`task/resubscribe` is no longer in the spec. However, `test_tasks_resubscribe` and `test_tasks_resubscribe_nonexistent` still attempt to send it as a method and test for its capability.

### Code of Conduct

- [x] I agree to follow this project's Code of Conduct

Look for the tests `test_tasks_resubscribe` and `test_tasks_resubscribe_nonexistent` in the test suite. They likely send a deprecated `task/resubscribe` method. Find where the streaming capability check is performed and update it to use the current spec method. Run these specific tests to verify they pass after the change.

Rédigé par le modèle d'indexation à partir du texte de l'issue.