Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/03a0cbf58b09
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #12196 from etiennesegonzac/hardened-conf-call-end

Bug 887764 - Ending a conference call properly. r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/c3e49ad02dc7
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 887764 - Ending a conference call properly.

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https://hg.mozilla.org/integration/gaia-central/rev/7bd901270fea
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #12165 from mikehenrty/bug-915236-emailscreenwake

Bug 915236 - Do not turn screen on for Email notifications, r=qDot

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https://hg.mozilla.org/integration/gaia-central/rev/8b4c1635509d
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 915236 - Do not turn screen on for Email notifications