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

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https://hg.mozilla.org/integration/gaia-central/rev/cd8bca91713b
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #11968 from lodr/bug-896917

Bug 896917 - Visual polish and behavior completed
r=jmcf

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https://hg.mozilla.org/integration/gaia-central/rev/038c506f33ff
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 896917 - Visual polish and behavior completed