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

========

https://hg.mozilla.org/integration/gaia-central/rev/413f661890d2
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #14790 from cctuan/951341

Bug 951341 - [Flatfish][Gallery] thumbnails are created much larger than needed on Flatfish

========

https://hg.mozilla.org/integration/gaia-central/rev/e215a484d842
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 951341 - [Flatfish][Gallery] thumbnails are created much larger than needed on Flatfish