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

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https://hg.mozilla.org/integration/gaia-central/rev/34586ee8ee64
Author: vingtetun <21@vingtetun.org>
Desc: Merge pull request #14292 from KevinGrandon/bug_942460_contacts_position_sticky_headers

Bug 942460 - [Contacts] Implement position:sticky for fixed headers

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https://hg.mozilla.org/integration/gaia-central/rev/45de63124616
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 942460 - [Contacts] Implement position:sticky for fixed headers r=bkelly
Bumping manifests a=b2g-bump