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

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https://hg.mozilla.org/integration/gaia-central/rev/8b31befd858b
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #22261 from wilsonpage/1043595

Bug 1043595 - [B2G][Camera] Camera capture button highlight animation is

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https://hg.mozilla.org/integration/gaia-central/rev/9aef92fa4f65
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1043595 - [B2G][Camera] Camera capture button highlight animation is square
Bumping manifests a=b2g-bump