flatpak 1.15.3

Build system:

* Building this version of Flatpak with Meson is recommended. The source
  release flatpak-1.15.3.tar.xz no longer contains Autotools-generated
  files, although this version can still be built using Autotools after
  running `./autogen.sh`. Future versions are likely to remove the
  Autotools build system.

Bug fixes:

* When splitting an upgrade into two steps (download without installing, and
  then upgrade without allowing further downloads) like GNOME Software does,
  if an app is marked EOL and superseded by a replacement, don't remove the
  superseded app in the first step, which would result in the replacement
  incorrectly not being installed (#5172)
* Fix a crash when --socket=gpg-agent is used (#5095)
* Fix a crash when listing apps if one of them is broken or misconfigured
  (#5293)
* If an app has invalid syntax in its overrides or metadata, mention the
  filename in the error message (#5293)
* Unset $GDK_BACKEND for apps, ensuring GTK apps with --socket=fallback-x11
  can work (#5303)
* Fix a deprecation warning when compiled with curl >= 7.85 (#5284)
* Translation updates: es, ru (#5266, #5312, #5313)

Internal changes:

* Better diagnostic messages for why runtimes are or are not considered
  unused (#5237)

Git-EVTag-v0-SHA512: a440a346d1107375245c3013c6b2d044eb187302bc6e4d1db66ec8c7b1a2353ee5b5edf8779d9378ea5c482619c40f003ccd7a3d9825a45f99ae356ac3db2a16
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