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

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https://hg.mozilla.org/integration/gaia-central/rev/139dc19925e2
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #20007 from wilsonpage/1016492

Bug 1016492 - [B2G][Flame][Camera] - Working animation / spinner missing

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https://hg.mozilla.org/integration/gaia-central/rev/8338a0aa603a
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1016492 - [B2G][Flame][Camera] - Working animation / spinner missing during the processing delay from taking a HDR picture.
Bumping manifests a=b2g-bump