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

========

https://hg.mozilla.org/integration/gaia-central/rev/f1b66be5c9f2
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #22392 from vingtetun/screenshoot-overlay-landing

Move the screenshot overlay into .browser-container. r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/2de91d28db3f
Author: Vivien Nicolas <vnicolas@mozilla.com>
Desc: Move the screenshot overlay into .browser-container. r=alive
Bumping manifests a=b2g-bump