Veusz updated to 3.3.1: please review and upload

[Jeremy Sanders <jeremy@jeremysanders.net>]

Dear all

Would it be possible to review and upload the update to veusz (3.3.1) 
from the repository? Not much has changed since the last update except 
for the upstream changes:

veusz (3.3.1-1) unstable; urgency=low

  * Update to Veusz 3.3.1
  * Bump Standards-Version to 4.5.1
  * Include upstream GPG signing key
  * Drop upstreamed sip5 compatibility patches
  * Increase debhelper-compat level to 13

I think it's in reasonable shape. It all builds fine using pbuilder for 
sid for me and in Salsa's CI:

https://salsa.debian.org/science-team/veusz/-/pipelines

Thanks again for your time and help

Jeremy