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

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https://hg.mozilla.org/integration/gaia-central/rev/4296bbf526e4
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #11926 from etiennesegonzac/bug-912490-call-for-test-selectors

Bug 912490 - Adding a css class to handledCall nodes to make them easier to target from marionette tests. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/e8827a940e10
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 912490 - Adding a css class to handledCall nodes to make them easier
to target from marionette tests.