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

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https://hg.mozilla.org/integration/gaia-central/rev/3a4d74ada4a4
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23845 from crdlc/bug-1062820

Bug 1062820 - Home screen and status bar behave different after clicking...

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https://hg.mozilla.org/integration/gaia-central/rev/11051c206c52
Author: crdlc <crdlc@tid.es>
Desc: Bug 1062820 - Home screen and status bar behave different after clicking home button among versions

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https://hg.mozilla.org/integration/gaia-central/rev/521a43a95cc8
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #22248 from mancas/bug981566

Bug 981566 - [settings] add marionette test for device information - You... r=gduan

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https://hg.mozilla.org/integration/gaia-central/rev/87321ffbbc74
Author: Manuel Casas Barrado <b.mcb@tid.es>
Desc: Bug 981566 - [settings] add marionette test for device information - Your Privacy
Bumping manifests a=b2g-bump