Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/bea83ee3c8e5
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #20580 from DouglasSherk/1019546-dialer-contacts-overlap

Bug 1019546 - [Dialer][Visual Refresh] Fix dialpad and contacts overlapping when moving from one to the other. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/5a19e72e5919
Author: DouglasSherk <github@sherk.me>
Desc: Bug 1019546 - [Dialer] Ensure AccessibilityHelper is loaded before using it. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/c657b71181ba
Author: DouglasSherk <github@sherk.me>
Desc: Bug 1019546 - [Dialer][Visual Refresh] Fix dialpad and contacts overlapping when moving from one to the other. r=etienne
Bumping manifests a=b2g-bump