Github action publish to pypy broken

[MWieland]

Successfully built a new minor release (v0.2.2) but cannot publish it to pypy. Github action build and publish returns

ERROR    HTTPError: 403 Forbidden from https://upload.pypi.org/legacy/          
         Invalid or non-existent authentication information. See                
         https://pypi.org/help/#invalid-auth for more information.              
Error: Process completed with exit code 1.

There seems to be an issue with the user credentials on pypy, but I do not have the permissions to modify secrets or user credentials. @kambrium can you please have a look at this?