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

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https://hg.mozilla.org/integration/gaia-2_0/rev/3b0fe4e5cff6
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #20651 from nullaus/v2.0

Merge pull request #20609 from nullaus/bug1024397

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https://hg.mozilla.org/integration/gaia-2_0/rev/52099ab9064f
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #20609 from nullaus/bug1024397

bug 1024397 - Hide value selector when receiving 'activityclosing'. r=al...
(cherry picked from commit 5a53248d2404b6aa292c5d425f62c222e5cc1fd2)
Bumping manifests a=b2g-bump