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

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https://hg.mozilla.org/integration/gaia-central/rev/fb06382958bf
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #11805 from RickyChien/issue-825913

Bug 825913 - Integrate code coverage library in the test agent r=@yurenju

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https://hg.mozilla.org/integration/gaia-central/rev/e806ded6d59f
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 825913 - Integrate code coverage library in the test agent