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

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https://hg.mozilla.org/integration/gaia-central/rev/61e8c0a15b56
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #13519 from comoyo/bug904973.vcard

Bug 904973: Streaming vcard parser implementation [r=wanderview]

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https://hg.mozilla.org/integration/gaia-central/rev/71a3a1e48dc3
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 904973: Streaming vcard parser implementation.