Log Message:
py-keyring: update to 25.3.0.

v25.3.0
=======

Features
--------

- Deprecated support for empty usernames. Now all backends will
reject an empty string as input for the 'username' field when
setting a password. Later this deprecation will become a more
visible user warning and even later an error. If this warning is
triggered in your environment, please consider using a static value
(even 'username') or comment in the issue and describe the use-case
that demands support for empty usernames. (#668)