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

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https://hg.mozilla.org/integration/gaia-central/rev/c30897e8c63c
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #11993 from arcturus/bug-894872

Bug 911086 - [CONTACTS] Export to Media option should only be active if there is a Media card in the device

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https://hg.mozilla.org/integration/gaia-central/rev/cea3f000bbeb
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 911086 - [CONTACTS] Export to Media option should only be active if there is a Media card in the device