Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/289849fcd525
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #24737 from alivedise/bugzilla/1073216_master/cancel-fullscreen

Bug 1073216 - cancel fullscreen when attention opening, r=etienne

========

https://hg.mozilla.org/integration/gaia-central/rev/b53b12f1cd64
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1073216 - cancel fullscreen when attention opening
Bumping manifests a=b2g-bump