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

========

https://hg.mozilla.org/integration/gaia-central/rev/4c242d1b9183
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #11839 from michalbe/vcard-headers

Bug 910164 - [Contacts] Contacts to vcard component now provides vcard header and footer r=arcturus

========

https://hg.mozilla.org/integration/gaia-central/rev/3bfad6d5749d
Author: Michal Budzynski <michal@virtualdesign.pl>
Desc: Bug 910164 - [Contacts] Contacts to vcard component now provides vcard header and footer