MAINT: rename token

[andyfaff]

Not quite clear why the scheduled upload has an error message about uploading. The invocation is the same as numpy's. Wondering if it's to do with capitalisation of the secret. I checked the secret name is spelled correctly.

/Users/runner/micromamba/envs/upload-env/lib/python3.14/site-packages/binstar_client/__init__.py:16: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
  from pkg_resources import parse_version as pv
/Users/runner/micromamba/envs/upload-env/lib/python3.14/site-packages/binstar_client/commands/authorizations.py:262: PendingDeprecationWarning: FileType is deprecated. Simply open files after parsing arguments.
  token_group.add_argument('--out', default=sys.stdout, type=argparse.FileType('w'))
usage: anaconda [-h] [--disable-ssl-warnings] [--show-traceback] [-v] [-q]
                [-t TOKEN] [-s SITE] [-V]
                 ...
anaconda: error: argument : invalid choice: 'scientific-python-nightly-wheels' (choose from auth, label, channel, config, copy, download, groups, login, logout, move, notebook, package, remove, search, show, update, upload, whoami)