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

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https://hg.mozilla.org/integration/gaia-central/rev/463249557715
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #11118 from crdlc/bug-896994

Bug 896994 - [Merge duplicate contacts] Clicking on list items does not ...

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https://hg.mozilla.org/integration/gaia-central/rev/b5a37156754d
Author: crdlc <crdlc@tid.es>
Desc: Bug 896994 - [Merge duplicate contacts] Clicking on list items does not work fine sometimes