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

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https://hg.mozilla.org/integration/gaia-1_2/rev/15baa43e24dd
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #12261 from snowmantw/issue905889

Bug 905889 - [Buri][PLMN]Network name will be shown twice, r=timdream