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

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https://hg.mozilla.org/integration/gaia-central/rev/94dcf317c5bd
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #25391 from alivedise/bugzilla/1079748/hierarchy-manager-v2

Bug 1079748 - Implement hierarchy manager, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/ab95c7ecf87d
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 1079748 - Implement hierarchy manager
Bumping manifests a=b2g-bump