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

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https://hg.mozilla.org/integration/gaia-central/rev/0372370cdeaf
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #17871 from dominickuo/bug-984313

Bug 984313 - [Music] @2.25x assets update, r=jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/b843139bbdee
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 984313 - [Music] @2.25x assets update
Bumping manifests a=b2g-bump