Drop url wheels from project metadata

[DavidStirling]

Looks like pypi doesn't allow packages which point directly to dependency URLs, which is understandable. This solution is less clean but should be permitted by the index.

[sbesson]

As mentioned separately, we might want to look into solutions to facilitate the consumption of our pre-built wheels in a variety of environments across the project. Immediately, this change fixes the validation issue reported in https://github.com/glencoesoftware/omero-user-token/actions/runs/13132342534 during the upload of the 0.4.0 artifact to the PyPI server, namely

ERROR    HTTPError: 400 Bad Request from https://upload.pypi.org/legacy/        
         Can't have direct dependency: zeroc-ice@                               
         https://github.com/glencoesoftware/zeroc-ice-py-linux-x86_64/releases/d
         ownload/20240202/zeroc_ice-3.6.5-cp39-cp39-manylinux_2_28_x86_64.whl ; 
         (platform_system == "Linux" and python_version == "3.9") and extra ==  
         "dev". See https://packaging.python.org/specifications/core-metadata   
         for more information.                                                  

[sbesson]

https://pypi.org/project/omero-user-token/0.4.1/