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

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https://hg.mozilla.org/integration/gaia-central/rev/94553ce8af01
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Merge pull request #11811 from comoyo/progress_update

Bug 910210 - Overlay.update() should accept an optional parameter to override internal counter [r=arcturus]

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https://hg.mozilla.org/integration/gaia-central/rev/eefe114ac2a2
Author: Sergi Mansilla <sergi.mansilla@gmail.com>
Desc: Bug 910210 - Overlay.update() should accept an optional parameter to override internal counter