Bumping gaia.json for 4 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/2e227922fc47
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #11880 from crh0716/911039

Bug 911039 - Support 3-state DNT settings r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/c665e71bdbe0
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 911039 - Support 3-state DNT settings

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https://hg.mozilla.org/integration/gaia-central/rev/ea5a8ff81733
Author: Salvador de la Puente González <salva@unoyunodiez.com>
Desc: Merge pull request #12029 from lodr/bug-910018-data-usage-threshold

Bug 910018 - Lowering the data check threshold.
r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/ed0f7d91941e
Author: lodr <salva@unoyunodiez.com>
Desc: Bug 910018 - Lowering the data check threshold.