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

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https://hg.mozilla.org/integration/gaia-central/rev/5a394b99e33c
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

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https://hg.mozilla.org/integration/gaia-central/rev/7ca7f7c42760
Author: Manuel Casas Barrado <mancas.91@gmail.com>
Desc: Bug 1053684 - [Clock] The Alarm sound volume is set at maximum after some common operations
Bumping manifests a=b2g-bump