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

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https://hg.mozilla.org/integration/gaia-central/rev/bf5a3448b008
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #24731 from dominickuo/bug-1055043

Bug 1055043 - [Music] modularize the views, r=jimporter

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https://hg.mozilla.org/integration/gaia-central/rev/775d1acb07e9
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1055043 - [Music] modularize the views
Bumping manifests a=b2g-bump