Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b74accd3a67a
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #19372 from alivedise/bugzilla/950673_master/delayed-animationend-statechange_v2

Bugzilla/950673 master/delayed animationend statechange v2, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/7a081dd574a7
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 950673 - Disable intermittent failing tests

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https://hg.mozilla.org/integration/gaia-central/rev/564d9fd1ef7a
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 950673 - Delay animationend event until active app loaded.
Bumping manifests a=b2g-bump