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

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https://hg.mozilla.org/integration/gaia-central/rev/76d79ac7239a
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 956031 - Checking for geolocation icon precludes this test from running on CI environments r=me