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

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https://hg.mozilla.org/integration/gaia-central/rev/24dd6b2b813c
Author: Sam Foster <sam@sam-i-am.com>
Desc: Merge pull request #23332 from sfoster/close-apps-task-manager-bug-1047143

Bug 1047143 - close aps entering task-manager, exitToApp to open/restore. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/f6b063ada354
Author: Sam Foster <sfoster@mozilla.com>
Desc: Bug 1047143 - close aps entering task-manager, exitToApp to open/restore

* Fix assumption that home event means homescreen opens in SoundManager,
* Remove appwillopen handler in AttentionScreen, applaunch will suffice
* Also listen for search app's requestforeground event
Bumping manifests a=b2g-bump