Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b0206a1b34d5
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #23531 from KevinGrandon/reland_bug_1035250

Bug 1035250 - Add incremental statusbar icons in FTU

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https://hg.mozilla.org/integration/gaia-central/rev/2a1becc1d0ad
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1035250 - Move utility tray initialization to finishInit

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https://hg.mozilla.org/integration/gaia-central/rev/4034578332cf
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1035250 - Add incremental statusbar icons in FTU
Bumping manifests a=b2g-bump