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

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https://hg.mozilla.org/integration/gaia-central/rev/37a295e9b0c6
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #11909 from etiennesegonzac/bug-912060-call-screen-exit-cleanup-and-fix

Bug 912060 - Better and more tested call screen toggling

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https://hg.mozilla.org/integration/gaia-central/rev/0485c79cd8d5
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 912060 - Better and more tested call screen toggling