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

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https://hg.mozilla.org/integration/gaia-central/rev/0a395a24388f
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #10811 from jrburke/bug890572-email-initial-transparent

Bug 890572 [email] set background transparent for smoother cold start r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/d7ec8d7f8077
Author: jrburke <jrburke@gmail.com>
Desc: Bug 890572 [email] set background transparent for smoother cold start