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

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https://hg.mozilla.org/integration/gaia-central/rev/fd60055ea541
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #12608 from gasolin/issue-923022

Bug 923022 - [Flatfish] correct the tablet app list, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/125e6f038049
Author: gasolin <gasolin@gmail.com>
Desc: Bug 923022 - [Flatfish] correct the tablet app list