Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/128c5d633538
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #13224 from zacc/bug_932355

Bug 923355 - wait for setting to be set after switching dnt toggle

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https://hg.mozilla.org/integration/gaia-central/rev/3f0e38ffc3af
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 923355 - wait for setting to be set after switching dnt toggle