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

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https://hg.mozilla.org/integration/gaia-central/rev/8c408b0b4a58
Author: Francisco Jordano <arcturus@ardeenelinfierno.com>
Desc: Merge pull request #23898 from jpruden92/bug1061411-contacts

Bug 1061411 - [Contacts] ICE 1 & ICE 2 can be set to the same contact

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https://hg.mozilla.org/integration/gaia-central/rev/06c81c789bd9
Author: jprudencio <jpruden92@gmail.com>
Desc: Bug 1061411 - [Contacts] ICE 1 & ICE 2 can be set to the same contact
Bumping manifests a=b2g-bump