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

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https://hg.mozilla.org/integration/gaia-2_0/rev/2bac141a25bf
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21730 from svic/Bug_998175_v2

Bug 998175 - Properly handle concurrent file transfers

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https://hg.mozilla.org/integration/gaia-2_0/rev/47ec8e5e2da2
Author: Arno Puder <arno@puder.org>
Desc: Bug 998175 - Properly handle concurrent file transfers
Bumping manifests a=b2g-bump