Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/138cb1659c91
Author: Dale  Harvey <dale@arandomurl.com>
Desc: Merge pull request #10861 from huchengtw-moz/camera/Bug_891243_image_pick_activity_take_2-3_seconds

Bug 891243 - [Camera] Image Pick activity takes 2-3 seconds to save afte. r=daleharvey

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https://hg.mozilla.org/integration/gaia-central/rev/b346a9f5886d
Author: John Hu <johu@mozilla.com>
Desc: Bug 891243 - [Camera] Image Pick activity takes 2-3 seconds to save after pressing "select" option