Use tifffile.TiffWriter's write method in test_cupy_imread

[jakirkham]

Fixes #397

Recently tifffile removed the save method, which has been deprecated. Switch to the write method to fix it.

[jakirkham]

@TomAugspurger could you please test this and let us know whether it fixes the issue you saw?

[m-albert]

Thanks @jakirkham 🙏

I probably missed this occurrence of TiffWriter.save because it's part of the cupy marked tests which I hadn't run.

[TomAugspurger]

@jakirkham confirmed that dask-image/tests/test_dask_image/test_imread/test_cupy_imread.py::test_cupy_imread passes with this branch and tifffile==2025.3.30.

[jakirkham]

Thanks Marvin and Tom! 🙏

No worries, Marvin. In fact Tom is helping us update to a newer GPU CI so this is covered there: rapidsai/dask-upstream-testing#39

Glad to hear this is passes Tom. In that case let's merge so we can get this fix in and move on to the next fix