Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/743a60517a60
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15628 from askeing/962935

Bug 962935 - Unxfail test_cost_control_data_alert_mobile.py

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https://hg.mozilla.org/integration/gaia-central/rev/95f347dbbfd8
Author: askeing <askeing@gmail.com>
Desc: Bug 962935 - Unxfail test_cost_control_data_alert_mobile.py

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https://hg.mozilla.org/integration/gaia-central/rev/ad52c235138d
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #15636 from MBRSL/bug-962980-cubVideo

Bug 962980 - [UITest][UI] Shrink the size of testing video used by fulls..., r=gasolin

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https://hg.mozilla.org/integration/gaia-central/rev/e8423fd4e34a
Author: Tom Jao <tjao@mozilla.com>
Desc: Bug 962980 - [UITest][UI] Shrink the size of testing video used by fullscreen_controls
Bumping manifests a=b2g-bump