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/1b1ba5a8dae0
Author: AndreiH <andrei.hutusoru@gmail.com>
Desc: Merge pull request #14460 from viorelaioia/bug-945261

Bug 945261 - [v1.2] Investigate intermittent fail in test_cards_view_lau...

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https://hg.mozilla.org/integration/gaia-1_2/rev/4326bb174e47
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 945261 - [v1.2] Investigate intermittent fail in test_cards_view_launch_app.py