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

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https://hg.mozilla.org/integration/gaia-central/rev/712f49f6b6ab
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #18299 from mcav/gelam-reply-all

Bug 884080 - [email] Reply-to-all does not filter out the active account. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/b46eddea7393
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Bug 884080 - [email] Reply-to-all does not filter out the active account. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/9b2997d17553
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #17783 from mihai/bug_984404

Bug 984404 - [FTE] Update navigation progress bar logic ... r=@fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/43324bcce674
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 984404 - [FTE] Update navigation progress bar logic to reflect current step. r=fcampo
Bumping manifests a=b2g-bump