Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/39145004f7c6
Author: Teodosia Pop <teodosia.pop@gmail.com>
Desc: Merge pull request #13659 from AndreiH/bug925851_v1.2

Bug 925851 - Re-enable test_capture_multiple_shots

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https://hg.mozilla.org/integration/gaia-1_2/rev/b8010ab0e121
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 925851 - Re-enable test_capture_multiple_shots