Python bindings: fix compatibility issue with SWIG 4.3.0 and PYTHONWARNINGS=error

[rouault]

Fixes #995

Upstream fix in OSGeo/gdal#11154

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

[rouault]

@conda-forge-admin, please rerender

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-webservice.

I tried to rerender for you, but it looks like there was nothing to do.

_{This message was generated by GitHub actions workflow run https://github.com/conda-forge/conda-forge-webservices/actions/runs/11560927228.}

[akrherz]

Awaiting conda-forge/status#188

[ocefpaf]

Awaiting conda-forge/status#188

Looks like they fix it but sometimes restarting the CI is not enough. Let's try it here.

@conda-forge-admin, please restart ci

[ocefpaf]

Maybe sending an empty commit here will do the trick.

[rouault]

All CI builds ok