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

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https://hg.mozilla.org/integration/gaia-central/rev/37ff07d95f18
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23975 from KevinGrandon/bug_1066339_statusbar_height_variables

Bug 1066339 - Use CSS variables for statusbar height

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https://hg.mozilla.org/integration/gaia-central/rev/4118d6feef43
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1066339 - Use CSS variables for statusbar height r=alive
Bumping manifests a=b2g-bump