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

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https://hg.mozilla.org/integration/gaia-central/rev/90c6c41b439b
Author: Marcus Cavanaugh <m@mcav.com>
Desc: Merge pull request #15198 from gnaneswar/Issue_951072

Bug 951072 - [Clock] Text alignment issue in alarm list; r=hhuang r=mcav

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https://hg.mozilla.org/integration/gaia-central/rev/b412d45bb524
Author: Gnaneswar Devuni <gnaneswar.devuni@accenture.com>
Desc: Bug 951072 - [Clock] Text alignment issue in alarm list; r=reviews
Bumping manifests a=b2g-bump