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/7e92a4eac36d
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14064 from AndreiH/bug_942824_v1.2

Bug 942824 - Improve wait in test_dialer_make_call

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https://hg.mozilla.org/integration/gaia-1_2/rev/abbc62801cb2
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 942824 - Improve wait in test_dialer_make_call