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

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https://hg.mozilla.org/integration/gaia-2_0/rev/772cd48980b1
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: Merge pull request #26423 from nullaus/v2.0

bug 1077595 -- With fixed unit test. a=testonly

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https://hg.mozilla.org/integration/gaia-2_0/rev/347c591e3de0
Author: Ghislain 'Aus' Lacroix <aus@noiseport.org>
Desc: bug 1077595 -- With fixed unit test. a=testonly
Bumping manifests a=b2g-bump