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

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https://hg.mozilla.org/integration/gaia-central/rev/429675e9e017
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #20055 from alivedise/bugzilla/1018836/skip-opening-for-immediate-animation

Bug 1018836 - Fix immediate transition issues r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/f64d6592110e
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1018836 - Fix immediate transition issues
Bumping manifests a=b2g-bump