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

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https://hg.mozilla.org/integration/gaia-2_1/rev/13cd254c3b76
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #26351 from dominickuo/v2.1-bug-1082938-reland

Bug 1082938 - [Music] set play status to playing when play event fires, r=jimporter

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https://hg.mozilla.org/integration/gaia-2_1/rev/bc1ef266870b
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1082938 - [Music] set play status to playing when play event fires
Bumping manifests a=b2g-bump