Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/b6daad0ed908
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #26216 from alivedise/bugzilla/1076605/revive-browser-when-necessary

Bug 1076605 - app is killed between launch and open

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https://hg.mozilla.org/integration/gaia-2_1/rev/bf470a9bb7a9
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1076605 - app is killed between launch and open

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https://hg.mozilla.org/integration/gaia-2_1/rev/ab705cdd31cf
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1076216 - Attention indicator polish
Bumping manifests a=b2g-bump