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

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https://hg.mozilla.org/integration/gaia-1_3/rev/bfb7a494643e
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #17808 from dominickuo/v1.3-bug-982540

Bug 982540 - [Music] Recover the status to PLAYING after the player is resumed from the mozinterrupend event, r=jimporter

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https://hg.mozilla.org/integration/gaia-1_3/rev/8438a6dd1888
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 982540 - [Music] Recover the status to PLAYING after the player is resumed from the mozinterrupend event
Bumping manifests a=b2g-bump