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

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https://hg.mozilla.org/integration/gaia-central/rev/5efa211f0198
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #23160 from TheoChevalier/bug1056975-fix-browser-tabs

Bug 1056975 -  Backout Browser specific CSS rules for French from 2.0 to...

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https://hg.mozilla.org/integration/gaia-central/rev/774edac542fe
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1056975 -  Backout Browser specific CSS rules for French from 2.0 to fix tabs in Browser

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https://hg.mozilla.org/integration/gaia-central/rev/0c8cd966bbe1
Author: russnicoletti <rnicoletti@mozilla.com>
Desc: Merge pull request #22938 from russnicoletti/bug-1047215

Bug 1047215 - [Gallery/Video]Background Overlays are not translated r=johu

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https://hg.mozilla.org/integration/gaia-central/rev/e10d840fa1fb
Author: Russ Nicoletti <rnicoletti@mozilla.com>
Desc: Bug 1047215 - [Gallery/Video]Background Overlays are not translated
Bumping manifests a=b2g-bump