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

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https://hg.mozilla.org/integration/gaia-central/rev/c7870a778626
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #14241 from mcjimenez/bug944495

Bug 944495 - Race condition when installing single variant apps

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https://hg.mozilla.org/integration/gaia-central/rev/3026eb65d625
Author: Carmen Jimenez Cabezas <cjc@tid.es>
Desc: Bug 944495 - Race condition when installing single variant apps