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

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https://hg.mozilla.org/integration/gaia-central/rev/a6dbe06165e8
Author: chirarobert <robert.chira@softvision.ro>
Desc: Merge pull request #24218 from bebef1987/timezone

Bug 1069911 - Update test_ftu_skip_tour setup

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https://hg.mozilla.org/integration/gaia-central/rev/7d27608def9f
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 1069911 - Update test_ftu_skip_tour setup
Bumping manifests a=b2g-bump