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

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https://hg.mozilla.org/integration/gaia-central/rev/729a514a3cc2
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #24102 from viorelaioia/bug_1067966

Bug 1067966 - Re-enable test_camera_capture_video.py as Bug 1066045 is f...

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https://hg.mozilla.org/integration/gaia-central/rev/4ca662527cb8
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1067966 - Re-enable test_camera_capture_video.py as Bug 1066045 is fixed

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https://hg.mozilla.org/integration/gaia-central/rev/15735a8d444c
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #24083 from viorelaioia/bug-1065973

Bug 1065973 - Change lock method to turn screen off/on

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https://hg.mozilla.org/integration/gaia-central/rev/48f2694f7194
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 1065973 - Change lock method to turn screen off/on
Bumping manifests a=b2g-bump