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

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https://hg.mozilla.org/integration/gaia-2_0/rev/64f0e47315a8
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #25018 from tauzen/Bug1071510_2.0

Bug 1071510 (2.0) - [NFC/sharing] Use shrinking* events to handle screenshot in AppWindow, r=alive

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https://hg.mozilla.org/integration/gaia-2_0/rev/46cbc3aa8003
Author: Krzysztof Mioduszewski <kmioduszewski@gmail.com>
Desc: Bug 1071510 (2.0) - [NFC/sharing] Use shrinking* events to handle screenshot in AppWindow, r=alive
Bumping manifests a=b2g-bump