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

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https://hg.mozilla.org/integration/gaia-central/rev/26fad79263f9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26459 from KevinGrandon/bug_1101158_use_tagged_template

Bug 1101158 - Use shared tagged template library for escaping card content

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https://hg.mozilla.org/integration/gaia-central/rev/3bbe686afb35
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1101158 - Use shared tagged template library for escaping card content r=aus r=freddyb

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https://hg.mozilla.org/integration/gaia-central/rev/de0c1f0eb0f8
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #26238 from arcturus/bug-1064502

Bug 1064502 - [RTL] Contacts List - Letters should not overlap contact names and faces. r=sergi

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https://hg.mozilla.org/integration/gaia-central/rev/a67ddd34d779
Author: Francisco Jordano <fjordano@mozilla.com>
Desc: Bug 1064502 - [RTL] Contacts List - Letters should not overlap contact names and faces. r=sergi
Bumping manifests a=b2g-bump