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

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https://hg.mozilla.org/integration/gaia-central/rev/9cb6eda2bec0
Author: RickyChien <RickyChien@users.noreply.github.com>
Desc: Merge pull request #26358 from RickyChien/bug-1090783

Bug 1090783 - Gaia build fails due to BUILD_CONFIG r=@cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/2a16ac7510fc
Author: Ricky Chien <ricky060709@gmail.com>
Desc: Bug 1090783 - Gaia build fails due to BUILD_CONFIG
Bumping manifests a=b2g-bump