Update the xfail skips for numpy for linalg

Author: asmeurer

Diff for: .github/workflows/numpy.yml

@@ -34,8 +34,9 @@ jobs:
         array_api_tests/test_creation_functions.py::test_linspace
         # https://github.com/numpy/numpy/issues/20870
         array_api_tests/test_data_type_functions.py::test_can_cast
-        # linalg tests generally need more mulling over
-        array_api_tests/test_linalg.py
+        # The return dtype for trace is not consistent in the spec
+        # (https://github.com/data-apis/array-api/issues/202#issuecomment-952529197)
+        array_api_tests/test_linalg.py::test_trace
         # waiting on NumPy to allow/revert distinct NaNs for np.unique
         # https://github.com/numpy/numpy/issues/20326#issuecomment-1012380448
         array_api_tests/test_set_functions.py