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

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https://hg.mozilla.org/integration/gaia-2_0/rev/6fb622e003a6
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #22437 from johngruen/bug-1013522-firefox-account-ui-should-match

FxA system UI fixes rebased for v2.0

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https://hg.mozilla.org/integration/gaia-2_0/rev/01354c68fd2d
Author: johngruen <john.gruen@gmail.com>
Desc: rebasefxa system UI fixes to v2.0
Bumping manifests a=b2g-bump