Debian package gpg signature packet v3 is not considered secure

[jman-schief]

Running on Debian/testing (frosty).

IIUC the warning I see, the gpg key needs to be updated.

$ sudo apt update --audit
...
Ign:3 https://proget.makedeb.org makedeb InRelease                                    
Get:4 https://proget.makedeb.org makedeb Release [7,608 B]
...
Warning: https://proget.makedeb.org/dists/makedeb/Release.gpg: Policy will reject signature within a year, see --audit for details
Audit: https://proget.makedeb.org/dists/makedeb/Release.gpg: Sub-process /usr/bin/sqv returned an error code (1), error message is:
   Error: Policy rejected packet type
   Caused by:
       Signature Packet v3 is not considered secure since 2026-02-01T00:00:00Z

(error log shows /usr/bin/sqv because I'm using Sequoia PGP Chameleon but I think it's not relevant to the issue)

Thanks