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

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https://hg.mozilla.org/integration/gaia-central/rev/794b54eb09de
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Merge pull request #11813 from fcampo/BT-receiveVcard

Bug 887663 - Receiving contact as a VCARD via Bluetooth (r=arcturus)

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https://hg.mozilla.org/integration/gaia-central/rev/91b71d9c8024
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 887663 - Receiving contact as a VCARD via Bluetooth