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

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https://hg.mozilla.org/integration/gaia-central/rev/f88201320e57
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #18246 from justindarc/bug993512

Bug 993512 - [B2G][Camera] Retaking a photo will briefly display previou... r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/112ab6a545b8
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 993512 - [B2G][Camera] Retaking a photo will briefly display previously taken image
Bumping manifests a=b2g-bump