Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8db3d8315bc0
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #22988 from mancas/bug1052938

Bug 1052938 - [B2G][Flame][2.0][Contact] No error message prompted when ...

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https://hg.mozilla.org/integration/gaia-central/rev/9c2a4362a2d8
Author: Manuel Casas Barrado <mancas.91@gmail.com>
Desc: Bug 1052938 - [B2G][Flame][2.0][Contact] No error message prompted when exporting contacts to a full SD card.
Bumping manifests a=b2g-bump