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

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https://hg.mozilla.org/integration/gaia-central/rev/396c32149ade
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14985 from askeing/955984

Bug 955984 - Fix test_ftu_skip_tour.py

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https://hg.mozilla.org/integration/gaia-central/rev/955962670be2
Author: askeing <askeing@gmail.com>
Desc: Bug 955984 - Fix test_ftu_skip_tour.py