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

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https://hg.mozilla.org/integration/gaia-central/rev/66734c1175c0
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #21660 from wilsonpage/1038024

Bug 1038024 - [Camera] Update camera to use gaia-icons v0.2.0

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https://hg.mozilla.org/integration/gaia-central/rev/f4edd9a4a3c7
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1038024 - [Camera] Update camera to use gaia-icons v0.2.0
Bumping manifests a=b2g-bump