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

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https://hg.mozilla.org/integration/gaia-2_0/rev/3f9e096ed04e
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #23072 from crdlc/bug-1055324

Bug 1055324 - [B2G][OTA][1.3 -> 2.0] E.Me apps on the homescreen do not ...

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https://hg.mozilla.org/integration/gaia-2_0/rev/cabc614f06b3
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #22977 from mancas/bug1053684

Bug 1053684 - [Clock] The Alarm sound volume is set at maximum r=mcav
Bumping manifests a=b2g-bump