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

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https://hg.mozilla.org/integration/gaia-central/rev/7f07b56e7715
Author: Askeing Yen (fyen) <askeing@gmail.com>
Desc: Merge pull request #16533 from zacc/bug_975404

Bug 975404 - StaleElementException in test_ftu_skip_tour.py r=askeing

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https://hg.mozilla.org/integration/gaia-central/rev/1f3b6f57faaa
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 975404 - StaleElementException in test_ftu_skip_tour.py r=askeing
Bumping manifests a=b2g-bump