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

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https://hg.mozilla.org/integration/gaia-central/rev/19ce9b087fd7
Author: Carsten Book <tomcat@mozilla.com>
Desc: Merge pull request #23746 from TheoChevalier/follow-up-costcontrol-widget-l10n

Bug 1063216 - Fix plural form in Usage widget. r=mai

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https://hg.mozilla.org/integration/gaia-central/rev/cbbe2ae80191
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 1063216 - Fix plural form in Usage widget
Bumping manifests a=b2g-bump