Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/794c6e42bf20
Author: Dave Huseby <dhuseby@mozilla.com>
Desc: Bug 943313 - AttributeError: 'builtin_function_or_method' object has no attribute 'sleep' after adding power draw support. r=dhunt