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

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https://hg.mozilla.org/integration/gaia-central/rev/231c4ee54e5f
Author: Myk Melez <myk@mozilla.org>
Desc: Merge pull request #11170 from mykmelez/master-fx-version

bug 898130 - label desktop-helper as fx-compatible and set recommended maxVersion; r=vingtetun, NPOTB

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https://hg.mozilla.org/integration/gaia-central/rev/de468c9f71d0
Author: Myk Melez <myk@mozilla.org>
Desc: label desktop-helper as fx-compatible and set recommended maxVersion