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

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https://hg.mozilla.org/integration/gaia-central/rev/bc63fe0648bb
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #23401 from alivedise/bugzilla/941238/suspending-app

Bug 941238 - Resume background apps by default, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/7886d2bb51ee
Author: Alive Kuo <alegnadise@gmail.com>
Desc: Bug 941238 - Resume background apps by default

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https://hg.mozilla.org/integration/gaia-central/rev/0e2b995e2ff9
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #22575 from wilsonpage/1015297

Bug 1015297 - [Settings] Update to use gaia-header

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https://hg.mozilla.org/integration/gaia-central/rev/aa123d3c0ca9
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 1015297 - [Settings] Update to use gaia-header
Bumping manifests a=b2g-bump