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

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https://hg.mozilla.org/integration/gaia-1_4/rev/a76b012af6a5
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #20993 from justindarc/bug1014968-v1.4

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

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https://hg.mozilla.org/integration/gaia-1_4/rev/c30fce922091
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