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

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https://hg.mozilla.org/integration/gaia-central/rev/3c8b807951c2
Author: Jared Hirsch <ohai@6a68.net>
Desc: Merge pull request #25626 from 6a68/bug-1087441-fmd-panel-font-fix

Bug 1087441: Apply font fix to FMD panel header. r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/5d33ce93a287
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 1087441: Apply font fix to FMD panel header, convert to AMD module. r=arthurcc
Bumping manifests a=b2g-bump