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

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https://hg.mozilla.org/integration/gaia-central/rev/4edd1282965e
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #18366 from bebef1987/xfail1

Bug 997105 - Xfail test_settings_cell_data because Bug 996645

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https://hg.mozilla.org/integration/gaia-central/rev/e51feafe897f
Author: Bebe <bebe@mozilla.ro>
Desc: Bug 997105 - Xfail test_settings_cell_data because Bug 996645
Bumping manifests a=b2g-bump