[pungi-fedora] PR #1156: Switch to F38 flatpak runtime for Silverblue

[Tomáš Hrčka]

humaton merged a pull-request against the project: `pungi-fedora` that you are following.

Merged pull-request:

``
Switch to F38 flatpak runtime for Silverblue
``

https://pagure.io/pungi-fedora/pull-request/1156