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

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https://hg.mozilla.org/integration/gaia-central/rev/acb413ea2913
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #24138 from gmarty/Bug-1062314-Visual-Refinements-Utility-Tray

Bug 1062314 - [Utility Tray] Visual Refinements Utility Tray

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https://hg.mozilla.org/integration/gaia-central/rev/aa4dce78b32d
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1062314 - [Utility Tray] Visual Refinements Utility Tray

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https://hg.mozilla.org/integration/gaia-central/rev/686d3da39623
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #24322 from anefzaoui/bug-1064539

Bug 1062964 - RTL in Notifications toaster is broken, r=timdream, f=gmarty

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https://hg.mozilla.org/integration/gaia-central/rev/d4087e192891
Author: Ahmed Nefzaoui <nefzaoui.ahmed@hotmail.com>
Desc: Bug 1062964 - RTL in Notifications toaster is broken
Bumping manifests a=b2g-bump