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/4c08d55064b3
Author: AndreiH <andrei.hutusoru@gmail.com>
Desc: Merge pull request #13327 from bobsilverberg/cp923355

Bug 934235 - [v1.2] Bring over changes in /gaiatest/apps/settings/regions/do_not_track.py

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https://hg.mozilla.org/integration/gaia-1_2/rev/2da934b54b59
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 923355 - wait for setting to be set after switching dnt toggle