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

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https://hg.mozilla.org/integration/gaia-central/rev/f619446b069a
Author: Marshall Culpepper <marshall.law@gmail.com>
Desc: Merge pull request #23872 from marshall/bug1054121_fteAnalyticsString

Bug 1054121: Update wording and layout of Data Sharing FTU screen

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https://hg.mozilla.org/integration/gaia-central/rev/3f6027ea7145
Author: Marshall Culpepper <marshall@mozilla.com>
Desc: Bug 1054121: Update wording and layout of Data Sharing FTU screen. r=sfoster r=Pike
Bumping manifests a=b2g-bump