Remove redundant linalg xfail

Should be skipped by new `xp_extension()` mark

Author: honno

.github/workflows/numpy.yml

@@ -31,8 +31,6 @@ jobs:
             "array_api_tests/test_creation_functions.py::test_linspace",
             # einsum is not yet completed in the spec
             "array_api_tests/test_signatures.py::test_has_names[einsum]",
-            # The linalg extension is not yet implemented in NumPy
-            "array_api_tests/test_signatures.py::test_has_names[linalg]",
             # dlpack support is not yet implemented in NumPy. https://github.com/numpy/numpy/pull/19083
             "array_api_tests/test_signatures.py::test_function_positional_args[__dlpack__]",
             "array_api_tests/test_signatures.py::test_function_positional_args[__dlpack_device__]",