Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/037ac28cf4c3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19897 from KevinGrandon/bug_1009111_move_home2_into_apps

Bug 1009111 - Move dev_apps/home2 -> apps/verticalhome

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https://hg.mozilla.org/integration/gaia-central/rev/1b93a6f0312d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1009111 - Move dev_apps/home2 -> apps/verticalhome

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https://hg.mozilla.org/integration/gaia-central/rev/6de446ab09f5
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #19345 from mihai/bug_1009535

Bug 1009535 - [FTU] Ensure progressbar shows steps within limits. r=@fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/b129c3366f06
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 1009535 - [FTU] Ensure navigation progressbar shows steps within limits. r=fcampo
Bumping manifests a=b2g-bump