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

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https://hg.mozilla.org/integration/gaia-central/rev/5c4fd687ba87
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #24550 from snowmantw/issue1073745

Bug 1073745 - [Lockscreen] Unlock to camera twice brings a blank screen.

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https://hg.mozilla.org/integration/gaia-central/rev/24bc64de0942
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1073745 - [Lockscreen] Unlock to camera twice brings a blank screen.

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https://hg.mozilla.org/integration/gaia-central/rev/29cf83d79f92
Author: Guillaume C. Marty <gmarty@users.noreply.github.com>
Desc: Merge pull request #24561 from gmarty/Bug-1074028-Overlapping-rocketbar-statusbar-icons-3rd-party-apps

Bug 1074028 - Overlapping rocketbar and statusbar icons for 3rd party apps

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https://hg.mozilla.org/integration/gaia-central/rev/8e3292e8a760
Author: Guillaume Marty <edo999@gmail.com>
Desc: Bug 1074028 - Overlapping rocketbar and statusbar icons for 3rd party apps
Bumping manifests a=b2g-bump