Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/20e2e86553d5
Author: Sam Joch <samuel@guiora.com>
Desc: Merge pull request #10400 from pivanov/bug-829023

Bug 829023 - [Settings] Don't use dividers to separate paragraphs in thesame text block | Follow up patch r=@samjoch

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https://hg.mozilla.org/integration/gaia-central/rev/9b4b4948696f
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 829023 - [Settings] Don't use dividers to separate paragraphs in thesame text block | Follow up patch