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

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https://hg.mozilla.org/integration/gaia-central/rev/eea6a5ec9a70
Author: Douglas Sherk <github@sherk.me>
Desc: Merge pull request #19984 from DouglasSherk/1020140-phone-input

Bug 1020140 - [Visual Refresh][Dialer] Make phone number input field unselectable. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/d2532b563a8f
Author: DouglasSherk <github@sherk.me>
Desc: Bug 1020140 - [Visual Refresh][Dialer] Make phone number input field unselectable. r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/1b11ed7be3e8
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Merge pull request #18641 from stasm/1000852-video-mozL10n.once

Bug 1000852 - Clean up bootstrap mozL10n API use in Video. r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/138e9e076f56
Author: Staś Małolepszy <stas@mozilla.com>
Desc: Bug 1000852 - Clean up bootstrap mozL10n API use in Video
Bumping manifests a=b2g-bump