bug#76660: current guix pull doesn't authenticate

[Jack Hill]

On Sun, 9 Mar 2025, Tomas Volf wrote:

I see few options:
1. Revert to previous good state using `guix pull --roll-back', and try
  pulling again.  Maybe it will help.

I reverted back to the oldest guix I had, 
4eaeff997907bc1b67884a6dc087756a50f175e2, and was able to pull with 
authentication up to the newest, 42773718d5d5d42137ac84826850256fd6bed606.

Many thanks!
Jack