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

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https://hg.mozilla.org/integration/gaia-central/rev/6339f53919ea
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #23823 from arcturus/bug-1064234

Bug 1064234 - [Contacts] When ICE contact's name is long, Setting menu isn't correctly visible r=sergi

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https://hg.mozilla.org/integration/gaia-central/rev/598d95789120
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Bug 1064234 - [Contacts] When ICE contact's name is long, Setting menu isn't correctly visible r=sergi
Bumping manifests a=b2g-bump