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

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https://hg.mozilla.org/integration/gaia-central/rev/fbc922929917
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #21592 from justindarc/bug1036312

Bug 1036312 - Camera flash flashes when in background

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https://hg.mozilla.org/integration/gaia-central/rev/628b4491adcd
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1036312 - Camera flash flashes when in background
Bumping manifests a=b2g-bump