APT repo signed with SHA1 which is insecure

[cthart]

apt update with the currently configured APT repo on Debian 13 yields:

Warning: http://linux.dropbox.com/debian/dists/trixie/Release.gpg: Policy will reject signature within a year, see --audit for details

This is because:

Audit: http://linux.dropbox.com/debian/dists/trixie/Release.gpg: Sub-process /usr/bin/sqv returned an error code (1), error message is:
Signing key on 1C61A2656FB57B7E4DE0F4C1FC918B335044912E is not bound:
No binding signature at time 2025-05-30T19:08:45Z
because: Policy rejected non-revocation signature (PositiveCertification) requiring second pre-image resistance
because: SHA1 is not considered secure since 2026-02-01T00:00:00Z