foreman-nightly-deb-pipeline 948 failed

[jenkins]

Foreman DEB nightly pipeline failed:

https://ci.theforeman.org/job/foreman-nightly-deb-pipeline/948/

foreman-pipeline-foreman-nightly-debian10-upgrade (failed) (remote job)
foreman-pipeline-foreman-nightly-debian10-install (passed) (remote job)
foreman-pipeline-foreman-nightly-debian11-install (passed) (remote job)
foreman-pipeline-foreman-nightly-ubuntu2004-upgrade (failed) (remote job)
foreman-pipeline-foreman-nightly-ubuntu2004-install (passed) (remote job)

[evgeni]

when upgrading, installer is upgraded earlier than kafo, and the postinst script bails on the UTF8 stuff we fixed in kafo.

fix: https://github.com/theforeman/foreman-packaging/pull/8015