Fix CI

Author: crusaderky

vendor_tests/test_vendor.py

@@ -20,10 +20,10 @@ def test_vendor_compat():
     device(x)
     assert not is_jax_array(x)
     assert is_writeable_array(x)
-    assert not is_cupy_namespace(x)
-    assert not is_jax_namespace(x)
-    assert not is_pydata_sparse_namespace(x)
-    assert not is_torch_namespace(x)
+    assert not is_cupy_namespace(xp)
+    assert not is_jax_namespace(xp)
+    assert not is_pydata_sparse_namespace(xp)
+    assert not is_torch_namespace(xp)
     assert size(x) == 3