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

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https://hg.mozilla.org/integration/gaia-central/rev/6745e7046ff9
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #13354 from julienw/924475-master-fix

Bug 924475 - [Messages] The context menu is missing the contact name and...

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https://hg.mozilla.org/integration/gaia-central/rev/2e8d579602e3
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 924475 - [Messages] The context menu is missing the contact name and mobile type r=borja

Do not output a header if this is a known contact