Bump the flatpak version used in CI to avoid a repeated definition of
`renameat2()` in libglnx and glibc.
See: https://github.com/ostreedev/ostree/pull/1871#issuecomment-
503768062
Closes: #1871
Approved by: jlebon
# Keep this pinned to avoid arbitrary change for now; it's also
# good to test building older code against newer ostree as it helps
# us notice any API breaks.
-FLATPAK_TAG=0.99.2
+FLATPAK_TAG=1.4.1
dn=$(dirname $0)
. ${dn}/libpaprci/libbuild.sh