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

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https://hg.mozilla.org/integration/gaia-central/rev/43b863a8cf4d
Author: Fabien Cazenave <fabien@mozilla.com>
Desc: Merge pull request #14924 from TheoChevalier/Bug952836-curvy-single-quote

Bug 952836 - [Gaia][l10n][en-US] Typography consistency, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/3b76d09c72e0
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 952836 - [Gaia][l10n][en-US] Typography consistency: curly single quote ’ vs. straight single quote '