Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/439743f0ec9e
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #20746 from julienw/1027586-ignore-leaks-task-manager-test

Bug 1027586 - [System] ignore leaks in system tests r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/30ec902a640c
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1027586 - [System] ignore leaks in system tests r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/2706085fd172
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #20675 from julienw/1016429-fix-settings-test-newer-mocha

Bug 1016429 - [Settings] Fix unit tests with a newer mocha r=cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/10c03cc878ce
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1016429 - [Settings] Fix unit tests with a newer mocha r=cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/ba44b837fd59
Author: Min-Zhong "John" Lu <mnjul@users.noreply.github.com>
Desc: Merge pull request #20487 from mnjul/bug_1023329_lockscreen_color_overlay_only_for_wallpaper_picker

Bug 1023329 - [VsD Refresh] Lockscreen Visual Refresh > Color overlay with notifications wrong with wallpapers chosen from gallery and camera

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https://hg.mozilla.org/integration/gaia-central/rev/482ed463aa20
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1023329 - [VsD Refresh] Lockscreen Visual Refresh > Color overlay with notifications wrong with wallpapers chosen from gallery and camera
Bumping manifests a=b2g-bump