can't install package from Ubuntu backports

[Marx1st]

Hi!

Ubuntu 22.04 comes with a too old version of Borgmatic (1.5.x). There is a version in backports, that would work (1.7.9). To install it via the role, I've added:

   borg_distro_packages:
      - borgmatic/jammy-backports

to the yaml, but I get this error:

(item=borgmatic/jammy-backports) => changed=false 
  ansible_loop_var: item
  item: borgmatic/jammy-backports
  msg: No package matching 'borgmatic/jammy-backports' is available

I can install it manually via "apt-get install borgmatic/jammy-backports" without problems.