Metadata for buster/backports

Matthias Klose <doko@debian.org> #

Vítězslav Dvořák <info@vitexsoftware.cz> #

• apt-repo-vitexsoftware 
  • com.vitexsoftware.repo.apt_source - 0.3~buster~30
• abraflexi-reminder 
  • io.github.vitexsoftware.abraflexi_reminder - 1.5~buster~25