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

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https://hg.mozilla.org/integration/gaia-central/rev/8d0d9c9e8818
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #20583 from justindarc/bug1019120

Bug 1019120 - [camera] Recorded video doesn't appear in Gallery

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https://hg.mozilla.org/integration/gaia-central/rev/7eed70ef54ea
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1019120 - [camera] Recorded video doesn't appear in Gallery
Bumping manifests a=b2g-bump