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

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https://hg.mozilla.org/integration/gaia-central/rev/aa339292bba2
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #20261 from alivedise/bugzilla/1023046_2.1/app2app-transition-finetune

Bug 1023046 - Finetune app to app tranisiton by ordering, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/66091d9ba221
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1023046 - Finetune app to app tranisiton by ordering
Bumping manifests a=b2g-bump