[python] Fix an import statement

[johnkerl]

Running python -m pytest tests from apis/python on my laptop I am seeing

FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.1-shape0-coords0] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.1-shape1-coords1] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.1-shape2-coords2] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape3-coords3] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape4-coords4] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape5-coords5] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape6-coords6] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape7-coords7] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape8-coords8] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape9-coords9] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape10-coords10] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape12-coords12] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape13-coords13] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape14-coords14] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape15-coords15] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape16-coords16] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.05-shape17-coords17] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.005-shape18-coords18] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.005-shape19-coords19] - ModuleNotFoundError: No module named 'sparse'
FAILED tests/test_sparse_nd_array.py::test_blockwise_table_iter_reindex[0.005-shape20-coords20] - ModuleNotFoundError: No module named 'sparse'

which makes sense given the "before" on this PR. In fact, I don't understand how this didn't fail in CI as well.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Files	Coverage Δ
apis/python/src/tiledbsoma/_read_iters.py	94.68% <100.00%> (ø)

... and 72 files with indirect coverage changes

📢 Thoughts on this report? Let us know!.