Announce: Flatpak 1.7.3

[Alexander Larsson]

Available at https://github.com/flatpak/flatpak/releases/tag/1.7.3

$ sha256sum flatpak-1.7.3.tar.xz
90c68861ae2ff3579106539d301b1cfc61e510976d8b56771d650506a9360d58
flatpak-1.7.3.tar.xz

The plan is to soon stabilize this and make a 1.8.0 release, so please
test this.

Changes in 1.7.3
================

 * Allow direct ALSA device access if app has pulseaudio access.
 * Flatpak now ships a sysusers.d file for allowing systemd to create
the required users.
 * Fix issue in remote-delete where it failed to delete system remotes
if it had to uninstall
   something first.
 * New library calls
flatpak_transaction_operation_get_related_to_ops(),
flatpak_transaction_operation_get_is_skipped() and
   flatpak_transaction_set_no_interaction().
 * New options --[no-]follow-redirect in remote-add/modify
 * New spawn portal APIs to get real pid of launched app.
 * By default, all OCI remotes now use the flatpak-oci-authenticator.
 * Support flatpak remote-info and flatpak update --commit= to
specific versions for OCI remotes.
 * Initial work in progress on using deltas for OCI remotes.
 * Fix race in the generation of ld.so.cache when starting copies of
the same app at the same time.
 * Minor fix in what locales are installed on update.
 * Flatpak uninstall now doesn't fail if one ref (of many) was not installed.
 * Flatpak systemd transient units now have an app-prefix to match new
XDG spec for
   cgroup names.
 * In some cases we previously downloaded the summary twice.
 * flatpak upgrade is now an alias for flatpak update.
 * Fix to selinux module to work without unconfined module.
 * Respect user XDG basedirs when finding users fonts and icons.
 * Fix issue where thread were sometimes initialized causing flatpak
enter to fail.
 * Better error reporting when authentication goes wrong.

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 Alexander Larsson                                Red Hat, Inc
       alexl at redhat.com         alexander.larsson at gmail.com