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

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https://hg.mozilla.org/integration/gaia-2_1/rev/1457d6b8a645
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #24182 from yzen/bug-1066793

Bug 1066793 - improved ambient notification indicator accessibility. r=a...

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https://hg.mozilla.org/integration/gaia-2_1/rev/35e92f0b28f4
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1066793 - improved ambient notification indicator accessibility. r=alive
Bumping manifests a=b2g-bump