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

========

https://hg.mozilla.org/integration/gaia-central/rev/1eba06eba038
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #18813 from timdream/truncate-app-name

Bug 1003672 - Find app by it's first 15 letters in b2g-ps, r=yurenju

========

https://hg.mozilla.org/integration/gaia-central/rev/a4e1ac26f9f5
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 1003672 - Find app by it's first 15 letters in b2g-ps
Bumping manifests a=b2g-bump