Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/91070081da26
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #17746 from arcturus/bug-984800

Bug 984800 - [MADAI][Contacts] @2.25x assets update for Contacts

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https://hg.mozilla.org/integration/gaia-central/rev/246d5476cefd
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 984800 - [MADAI][Contacts] @2.25x assets update for Contacts
Bumping manifests a=b2g-bump