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

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https://hg.mozilla.org/integration/gaia-central/rev/a2c81e8d8f64
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #19794 from mihai/bug_1017893

Bug 1017893 - Fix broken references in FTU unit tests. r=@fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/9b2d9d5c4ae3
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 1017893 - Fix broken references in FTU unit tests. r=fcampo
Bumping manifests a=b2g-bump