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

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https://hg.mozilla.org/integration/gaia-central/rev/052499d9ddb8
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #16150 from KevinGrandon/bug_966726_eme_styling_followup

Bug 966726 - Web result icon styling

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https://hg.mozilla.org/integration/gaia-central/rev/581abcf0b867
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 966726 - Web result icon styling
Bumping manifests a=b2g-bump