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

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https://hg.mozilla.org/integration/gaia-central/rev/c69a991859de
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #10975 from crdlc/bug-893719

Bug 893719 - [SD card] Vcard parser should deal with the case: number of contacts is zero

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https://hg.mozilla.org/integration/gaia-central/rev/8ff7a38e351a
Author: crdlc <crdlc@tid.es>
Desc: Bug 893719 - [SD card] Vcard parser should deal with the case: number of contacts is zero