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

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https://hg.mozilla.org/integration/gaia-central/rev/bca31cd48f12
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #17976 from wilsonpage/bug/991924

Bug 991924 - [Camera][Buri] Performance regression when selecting shutter button (camera and video)

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https://hg.mozilla.org/integration/gaia-central/rev/0bf8950700d2
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 991924 - [Camera][Buri] Performance regression when selecting shutter button (camera and video)
Bumping manifests a=b2g-bump