This release to the 1.2 old stable series matches some new features that were added in 1.4.3 stable release. These are backported because these features are in use on flathub at the moment.
The main feature is the support for allowing the use of extra_data for runtimes (as opposed to only for apps) which is used by the new org.freedesktop.Platform.openh264 extension.
Supporting this, flatpak now supports specifying several flatpak versions to require, rather than just a single one. This is used by the above extension in order to express that it needs flatpak 1.2.5 or 1.4.2 (but not e.g. 1.4.1).
Only the client side features for this are backported. To build such extensions you need to use a newer flatpak.
Other changes are:
sudo dnf upgrade --advisory=FEDORA-2019-802e9178eb
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