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

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https://hg.mozilla.org/integration/gaia-central/rev/33d22cba7641
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #11860 from rnowm/821673

Bug 821673 - Redesign back, menu and close buttons

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https://hg.mozilla.org/integration/gaia-central/rev/1b57a5c8be1d
Author: Arnau <arnau@arnaumarch.com>
Desc: Bug 821673 - Redesign back, menu and close buttons