Announce: Flatpak 1.6.4

[Alexander Larsson]

Available here:
  https://github.com/flatpak/flatpak/releases/tag/1.6.4

$ sha256sum flatpak-1.6.4.tar.xz
700328b990d89a21f27b7365611a1e51879916cd69068b0bf794df057c9fe448
flatpak-1.6.4.tar.xz

This release backports some of the OCI authenticator fixes from the
1.7 series, and
should now be able to host flatpak images on e.g. docker hub.

Other changes:
 * Fix a use-after free in libflatpak
 * Don't list p2p downgrades in list of available updates

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