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

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https://hg.mozilla.org/integration/gaia-central/rev/2d443e3eebba
Author: Ran Ben Aharon <ran@everything.me>
Desc: Merge pull request #12423 from EverythingMe/bugfix-915467

Bug 915467 - [e.me][bug] Provider init may occur before Homescreen init [r=crdlc]

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https://hg.mozilla.org/integration/gaia-central/rev/39ccd7794b31
Author: Ran Ben Aharon <ran@ranbena.com>
Desc: Bug 915467 - [e.me][bug] Provider init may occur before Homescreen init [r=crdlc]