Fix usage of deprecated Pillow interpolation methods

[neoaggelos]

Summary

This small PR updates the interpolation methods used by Keras to resolve the following DeprecationWarning messages.

Note that this is important since Pillow is not pinned in the requirements.txt, and Pillow 10 will remove the used values.

keras/utils/image_utils.py:36 DeprecationWarning: NEAREST is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.NEAREST or Dither.NONE instead.
    'nearest': pil_image.NEAREST,

keras/utils/image_utils.py:37 DeprecationWarning: BILINEAR is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.BILINEAR instead.
    'bilinear': pil_image.BILINEAR,

keras/utils/image_utils.py:38 DeprecationWarning: BICUBIC is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.BICUBIC instead.
    'bicubic': pil_image.BICUBIC,

keras/utils/image_utils.py:39 DeprecationWarning: HAMMING is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.HAMMING instead.
    'hamming': pil_image.HAMMING,

keras/utils/image_utils.py:40 DeprecationWarning: BOX is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.BOX instead.
    'box': pil_image.BOX,

keras/utils/image_utils.py:41 DeprecationWarning: LANCZOS is deprecated and will be removed in Pillow 10 (2023-07-01). Use Resampling.LANCZOS instead.
    'lanczos': pil_image.LANCZOS,

Versions

$ pip freeze | grep Pillow
Pillow==9.2.0

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[fchollet]

Thanks for the PR!

[fchollet]

LGTM, thanks