Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7616d9158946
Author: Anthony Ricaud <anthony@ricaud.me>
Desc: Merge pull request #21213 from pacorampas/USSD-screen-1030049

Bug 1025631 - Incomplete visual refresh for USSD screen r=rik

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https://hg.mozilla.org/integration/gaia-central/rev/d0ad21ceb4f8
Author: Paco Rampas <pacorampas@gmail.com>
Desc: Bug 1025631 - Incomplete visual refresh for USSD screen

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https://hg.mozilla.org/integration/gaia-central/rev/d919c67e1129
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #21291 from bebef1987/music_time

Bug 970915 - Music test - return elapsed time as a time object and asser...

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https://hg.mozilla.org/integration/gaia-central/rev/5d3d12aeae9a
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 970915 - Music test - return elapsed time as a time object and assert appropriately
Bumping manifests a=b2g-bump