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

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https://hg.mozilla.org/integration/gaia-2_0/rev/4ec63cdc1f22
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #21060 from justindarc/bug1014968-v2.0

Bug 1014968 - [B2G][Camera][Flame] When watching a video preview in came...

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https://hg.mozilla.org/integration/gaia-2_0/rev/83f013e8c5a3
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1014968 - [B2G][Camera][Flame] When watching a video preview in camera, there will be a cropping issue towards the end of the video
Bumping manifests a=b2g-bump