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

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https://hg.mozilla.org/integration/gaia-central/rev/65ba7a3f16b3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23124 from KevinGrandon/bug_1054447_start_page_refinements

Bug 1054447 - [Browser] Browser Start Page Refinements

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https://hg.mozilla.org/integration/gaia-central/rev/4fce33b3dbe4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1054447 - [Browser] Browser Start Page Refinements ui-r=epang r=kgrandon
Bumping manifests a=b2g-bump