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

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https://hg.mozilla.org/integration/gaia-central/rev/2cd0bcf4ab00
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #11693 from yurenju/build-module

bug 905096 - Build script modularization r=@timdream

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https://hg.mozilla.org/integration/gaia-central/rev/5a2aa872c58e
Author: Yuren Ju <yurenju@gmail.com>
Desc: bug 905096 - Build script modularization