Backport of "gtk4: update flatpak integration code" into 0.12
requested to merge gstreamer-backport-bot/gst-plugins-rs:mr-1600-backport-into-0.12-wip-vixalien-gtk4-flatpak into 0.12
Backport of !1600 (merged) "gtk4: update flatpak integration code".
Commits:
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c9ac553c
gtk4: update flatpak integration code