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

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https://hg.mozilla.org/integration/gaia-central/rev/ad2003d5d3d3
Author: Reuben Morais <reuben.morais@gmail.com>
Desc: Merge pull request #13597 from reubenmorais/pt-br-symbols

Bug 936565 - Use default symbols layout in the pt-BR keyboard

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https://hg.mozilla.org/integration/gaia-central/rev/527e65d53052
Author: Reuben Morais <reuben.morais@gmail.com>
Desc: Bug 936565 - Use default symbols layout in the pt-BR keyboard. r=djf