Fix AttributeError with Pillow >= 10.0

[cgohlke]

The deprecated Image.ANTIALIAS constant was removed in Pillow 10.0. See https://pillow.readthedocs.io/en/stable/deprecations.html#constants

[molinav]

Hi @cgohlke! Thanks for your contribution, I will try to accept the merge request as soon as possible.

I need to check if Image.LANCZOS is available only on recent pillow versions or if the name has been there for a while. Otherwise I will need to update the PR change to something like getattr(Image, "LANCZOS", "ANTIALIAS").

The error in the GitHub actions is unrelated to your change, I am also trying to find a solution.

[cgohlke]

Image.LANCZOS was added in Pillow 2.7.0, released Dec 31, 2014. See python-pillow/Pillow@43d5d06

[molinav]

@cgohlke Sorry for the late reply. Thanks for digging into the pillow history. This constant name is really coming from very long ago, so it should be perfectly safe to apply the PR.

As I mentioned some days before, the workflow is failing but due to an unrelated problem, which I am currently looking at. Being the PR merged into the develop branch, this change would appear in the basemap release 1.4.0.

[molinav]

In the end I backported this bugfix to the hotfix-1.3.8 branch, so it will also be available for the basemap release 1.3.8.