Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/a06ac3ceff33
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #22616 from dominickuo/bug-1050112

Bug 1050112 - [Music] correct the media-button path, r=jimporter(cherry picked from commit fee004dbe33efc7f7269ed19f951763bb4ea1874)
Bumping manifests a=b2g-bump