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

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https://hg.mozilla.org/integration/gaia-central/rev/9020773c7b02
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #11104 from cctuan/896594

Bug 896594 - [B2G][Leo][Settings]Display: The brightness adjustment slider is unresponsive. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/19023daae1f9
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 896594 - [B2G][Leo][Settings]Display: The brightness adjustment slider is unresponsive.