Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/d08fa083ecea
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #24853 from jrburke/bug1077605-email-screen-black-scroll

Bug 1077605 - [Email] Screen becomes black when scrolling through list fast

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https://hg.mozilla.org/integration/gaia-central/rev/74f78e13ae78
Author: jrburke <jrburke@gmail.com>
Desc: Bug 1077605 - [Email] Screen becomes black when scrolling through list fast

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https://hg.mozilla.org/integration/gaia-central/rev/d37734928d79
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #24856 from DouglasSherk/1068104-system-call-screen-wakeup

Bug 1068104 - Wake up the screen when all calls are ended. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/b549dc5f69ea
Author: Doug Sherk <github@sherk.me>
Desc: Bug 1068104 - Wake up the screen when all calls are ended. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/297ba021b454
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1076231 - [SimPicker] fix racy unit tests r=drs

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https://hg.mozilla.org/integration/gaia-central/rev/7bed7e210859
Author: Doug Sherk <github@sherk.me>
Desc: Revert "Bug 1076231 - Fix racy unit tests in GaiaSimPicker. r=Rik"

This reverts commit 0bb4873f27d1fb755357d2e1b0248ce0329d1743.
Bumping manifests a=b2g-bump