Bumping gaia.json for 2 gaia-central revision(s)

========

https://hg.mozilla.org/integration/gaia-central/rev/6991d4067741
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #11344 from fcampo/TutorialSwipeLeft

Bug 901041 - Remove 'swipe left' screen in tutorial (as part of the first run experience)

========

https://hg.mozilla.org/integration/gaia-central/rev/03ec92421539
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 901041 - Remove 'swipe left' screen in tutorial (as part of the first run experience)