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

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https://hg.mozilla.org/integration/gaia-central/rev/37e01a6616e0
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26901 from huchengtw-moz/bug-1107950-home-as-overlay

Bug 1107950 - [Stingray][System] homescreen app is shown as overlay on t..., r=rexboy, r=lchang

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https://hg.mozilla.org/integration/gaia-central/rev/b3667d708d94
Author: John Hu <johu@mozilla.com>
Desc: Bug 1107950 - [Stingray][System] Show homescreen app as overlay on top of an alive app while press home
Bumping manifests a=b2g-bump