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

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https://hg.mozilla.org/integration/gaia-central/rev/80e022c6b46d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19300 from KevinGrandon/bug_1010640_home2_shadows

Bug 1010640 - [Home2] Implement new thin dropshadows for app icons

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https://hg.mozilla.org/integration/gaia-central/rev/77a0c20068b4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1010640 - [Home2] Implement new thin dropshadows for app icons r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/56e2f2b4684d
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19329 from flodolo/bug1011558

Bug 1011558 - [SMS] Attachment download indicator: improve l10n comments

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https://hg.mozilla.org/integration/gaia-central/rev/c71c2c1b78a9
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 1011558 - [SMS] Attachment download indicator: improve localization comments
Bumping manifests a=b2g-bump