Bumping gaia.json for 6 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/790517c7c868
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #17824 from arcturus/bug-988430

Bug 988430 - [B2G][Contacts] Cancelling on allow offline access page for importing Gmail contacts brings user to blank page

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https://hg.mozilla.org/integration/gaia-central/rev/9c833a5ce917
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 988430 - [B2G][Contacts] Cancelling on allow offline access page for importing Gmail contacts brings user to blank page

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https://hg.mozilla.org/integration/gaia-central/rev/5218c550ab1a
Author: GaryChen,PYChen <mmm198219@gmail.com>
Desc: Merge pull request #17844 from shamenchens/Bug988802-Video2.25x-Asset

Bug 988802 - [MADAI][Video] @2.25x assets update for Video. r=johnhu.

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https://hg.mozilla.org/integration/gaia-central/rev/9d5cebbe4060
Author: Sherman Chen <shamen.chens@gmail.com>
Desc: Bug 988802 - [MADAI][Video] @2.25x assets update for Video

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https://hg.mozilla.org/integration/gaia-central/rev/2481ad014501
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #17817 from guilherme-pg/findmydevice

Findmydevice

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https://hg.mozilla.org/integration/gaia-central/rev/9306504aa256
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Bug 938896 - Find My Device client.
Bumping manifests a=b2g-bump