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

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https://hg.mozilla.org/integration/gaia-central/rev/a96683469011
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #23306 from chirarobert/fix_delete_app

Bug 1058427 - [v2.1] Fix test_homescreen_delete_app

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https://hg.mozilla.org/integration/gaia-central/rev/3559a7d0b830
Author: Robert Chira <robertchira@P5075.(none)>
Desc: Bug 1058427 - [v2.1] Fix test_homescreen_delete_app

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https://hg.mozilla.org/integration/gaia-central/rev/b09da2eb29f4
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #23078 from EverythingMe/1033641-create-offline

Bug 1033641 - [Vertical Homescreen] [Collections] [SCR] Ability to create collection groups offline

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https://hg.mozilla.org/integration/gaia-central/rev/b0d9c26134b9
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 1033641 - [Vertical Homescreen] [Collections] [SCR] Ability to create collection groups offline
Bumping manifests a=b2g-bump