Update conda package

The `conda` package supports only `python` <= 3.8. In order to update, afaik, the upstream path starts from `itk`.

Please check and accept https://github.com/conda-forge/itk-feedstock/pull/36 so that the work on the `itkwidgets` update can continue.

Otherwise, could you please provide a roadmap for updating the `conda` option.

Thanks

Start by reviewing the conda packaging configuration and the upstream itk-feedstock pull request #36, then trace how that dependency constrains the itkwidgets update. Done means the conda package supports a newer Python version and the itkwidgets update can proceed, or a documented roadmap is provided.

Scritto dal modello di indicizzazione a partire dal testo della issue.