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

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https://hg.mozilla.org/integration/gaia-central/rev/6a632010d018
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #18790 from stasm/1003191-fl-ready

Bug 1003191 - Use mozL10n.once in the fl app. r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/8ee527ca50c3
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1003191 - Use mozL10n.once in the fl app. r=djf
Bumping manifests a=b2g-bump