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

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https://hg.mozilla.org/integration/gaia-central/rev/682fb944ab2b
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #20021 from justindarc/bug1018412

Bug 1018412 - [Camera] Integration test for pinch-to-zoom

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https://hg.mozilla.org/integration/gaia-central/rev/115250a6c95b
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Bug 1018412 - [Camera] Integration test for pinch-to-zoom
Bumping manifests a=b2g-bump