uscan had problems while searching for a new upstream version:

In debian/watch no matching files for watch source
  https://github.com/ruby/scanf/releases

vcswatch reports that this package seems to have a new changelog entry (version 1.0.0-3, distribution UNRELEASED) and new commits in its VCS. You should consider whether it's time to make an upload.

Here are the relevant commit messages:

commit 2ad997c3716cbab9491c9c8cfd7e188ce9de13d9
Author: Lucas Nussbaum <lucas@debian.org>
Date:   Sat Sep 6 05:46:41 2025 +0000
    debian/salsa-ci.yml: use team-specific include
commit cee2e147b585919cc7ff13276019a39d3fcf0c7d
Author: Lucas Nussbaum <lucas@debian.org>
Date:   Sun Aug 24 18:42:37 2025 +0000
    debian/gbp.conf: remove trailing empty lines
commit 1cdcc4e43898a2ac772e916092e48591e25143b3
Author: Lucas Nussbaum <lucas@debian.org>
Date:   Sun Aug 24 14:49:13 2025 +0000
    debian/gbp.conf: Add for DEP-14
commit 90ed88994c7763e04b31d137ca5efa2ef3251d34
Merge: 5551cc9 e22d197
Author: Cédric Boutillier <boutil@debian.org>
Date:   Thu Nov 16 16:01:23 2023 +0000
    Merge branch 'master' into 'master'
    New release
    See merge request ruby-team/ruby-scanf!1
commit e22d197ba9c45dd63ddf7ca1e8b19287cd38a575
Author: Marcos574 <mvdeus574@gmail.com>
Date:   Tue Nov 7 00:33:01 2023 -0300
    d/changelog: preparing changelog for new release
commit 8d04240a53e5c200d6c180c42df5cf0d956db63c
Author: Marcos574 <mvdeus574@gmail.com>
Date:   Tue Nov 7 00:32:09 2023 -0300
    d/control: Bump Standards-Version to 4.6.2, no changes needed
commit 5551cc9ced9fb52926fd80212151ed75f192d6ed
Author: Debian Janitor <janitor@jelmer.uk>
Date:   Fri Oct 14 23:23:32 2022 +0000
    Apply multi-arch hints.
    + ruby-scanf: Add Multi-Arch: foreign.
    Changes-By: apply-multiarch-hints
commit 3e5f4819fa76770e84b64ea5ccb1c301e573ad78
Author: Debian Janitor <janitor@jelmer.uk>
Date:   Wed Sep 28 06:09:12 2022 +0000
    Update standards version to 4.6.1, no changes needed.
    Changes-By: lintian-brush
    Fixes: lintian: out-of-date-standards-version
    See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html
commit 7d56f03091d352ddbdf71394e21a4760b976564c
Author: Debian Janitor <janitor@jelmer.uk>
Date:   Wed Sep 28 06:09:12 2022 +0000
    debian/watch: Use GitHub /tags rather than /releases page.
    Changes-By: lintian-brush
commit 2d0952db5586e26bda92f43b636a93650301b720
Author: Debian Janitor <janitor@jelmer.uk>
Date:   Tue Jul 26 07:49:58 2022 +0000
    Update standards version to 4.6.0, no changes needed.
    Changes-By: lintian-brush
    Fixes: lintian: out-of-date-standards-version
    See-also: https://lintian.debian.org/tags/out-of-date-standards-version.html

https://salsa.debian.org/api/v4/projects/ruby-team%2Fruby-scanf API request failed: 401 Unauthorized at /srv/qa.debian.org/data/vcswatch/vcswatch line 410.