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

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https://hg.mozilla.org/integration/gaia-1_2/rev/cd884d75bee9
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 915570 - (part III) rename permission in test-ime, r=me, a=testonly