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

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https://hg.mozilla.org/integration/gaia-central/rev/5a7d8dc62349
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #14111 from fabi1cazenave/appShadow-bug943790

Bug 943790 - [Settings] unsupported rule in apps.css

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https://hg.mozilla.org/integration/gaia-central/rev/e188f2fe1772
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Bug 943790 - [Settings] unsupported rule in apps.css