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

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https://hg.mozilla.org/integration/gaia-central/rev/f2dfdd4db54d
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #24683 from mancas/bug1065279

Bug 1065279 - [settings] refactor Hotspot panel with AMD pattern r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/d28b71029de8
Author: Manuel Casas Barrado <manuel.casasbarrado@telefonica.com>
Desc: Bug 1065279 - [settings] refactor Hotspot panel with AMD pattern

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https://hg.mozilla.org/integration/gaia-central/rev/edbcc2ca3911
Author: pacorampas <b.frv@tid.es>
Desc: Merge pull request #25353 from pacorampas/1085258

Bug 1085258 - [BB] remove dividers in toolbars r=arnau

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https://hg.mozilla.org/integration/gaia-central/rev/9f694d521746
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1085258 - [BB] remove dividers in toolbars
Bumping manifests a=b2g-bump