[ Reason ]
libhtml-gumbo-perl has a security issue in the version in bookworm. We
don't feel that warrants a DSA, but would like to see it updated in
bookworm before the final point release.

Bug report for the security issue:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1104789

CVE-2025-15646

[ Impact ]
Users of this package will be exposed to this security issue.

[ Tests ]
The package has built in test cases, these all pass.

The patch has been accepted upstream.

[ Risks ]
There is minimal risk.

[ Checklist ]
  [x] *all* changes are documented in the d/changelog
  [x] I reviewed all changes and I approve them
  [x] attach debdiff against the package in (old)stable
  [x] the issue is verified as fixed in unstable

[ Changes ]
The change adds handling for the template HTML element.

[ Other info ]
I've been discussing this with Salvatore Bonaccorso.