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

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https://hg.mozilla.org/integration/gaia-central/rev/23fea49fdb66
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #15013 from comoyo/952724

Bug 952724 - Make InputContext#replaceSurroundingText match spec. r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/33f9227caa94
Author: Yuan Xulei <xyuan@mozilla.com>
Desc: Bug 952724 - Make InputContext#replaceSurroundingText match spec. r=djf