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

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https://hg.mozilla.org/integration/gaia-central/rev/927328e4b074
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #18933 from stasm/1000599-settings-ready

Bug 1000599 - Use the new & fixed mozL10n.ready in Settings. r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/d64f77841220
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1000599 - Use the new & fixed mozL10n.ready in Settings. r=arthur

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https://hg.mozilla.org/integration/gaia-central/rev/6b99f1e3e7ee
Author: Arnau <arnau@arnaumarch.com>
Desc: Merge pull request #19063 from pacorampas/buttons-settings-1003817

Bug 1007628 - [Follow up] [BB] Buttons: update list button to new specs r=me

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https://hg.mozilla.org/integration/gaia-central/rev/5ef837551b7d
Author: Paco Rampas <pacorampas@gmail.com>
Desc:  Bug 1007628 - [Follow up] [BB] Buttons: update list button to new specs
Bumping manifests a=b2g-bump