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

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https://hg.mozilla.org/integration/gaia-central/rev/5ae83195a7b0
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #13745 from gasolin/issue-935833

Bug 935833 - [Flatfish] [System] Make sleep menu not fill full screen, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/2b59fed765ea
Author: gasolin <gasolin@gmail.com>
Desc: Bug 935833 - [Flatfish] [System] Make sleep menu not fill full screen