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/115ad0cb8f30
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14017 from AndreiH/bug942720_v1.2

Bug 942720 - Fix test_settings_airplane_mode.py

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https://hg.mozilla.org/integration/gaia-1_2/rev/c19018476e9b
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 942720 - Fix test_settings_airplane_mode.py