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

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https://hg.mozilla.org/integration/gaia-central/rev/ae9f47131446
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #12931 from AlinT/improve_import_sim

Bug 927886 - Impprove test_import_contacts_from_SIM

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https://hg.mozilla.org/integration/gaia-central/rev/d8363356ad92
Author: AlinT <trifandreialin@gmail.com>
Desc: Bug 927886 - Impprove test_import_contacts_from_SIM