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

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https://hg.mozilla.org/integration/gaia-central/rev/49d173267ac5
Author: Yura Zenevich <yura.zenevich@gmail.com>
Desc: Merge pull request #23489 from yzen/bug-1030390

Bug 1030390 - improved cards view and taks manager accessibility. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/1bc4bf953d23
Author: Yura Zenevich <yzenevich@mozilla.com>
Desc: Bug 1030390 - improved cards view and taks manager accessibility. r=alive
Bumping manifests a=b2g-bump