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

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https://hg.mozilla.org/integration/gaia-central/rev/8bd420d84860
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17257 from zacc/bug_983059

Bug 983059 - Wait for mozWifiManager to be ready before proceeding with ...

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https://hg.mozilla.org/integration/gaia-central/rev/b77d76a183df
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 983059 - Wait for mozWifiManager to be ready before proceeding with test_ftu_skip_tour.py
Bumping manifests a=b2g-bump