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

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https://hg.mozilla.org/integration/gaia-central/rev/746adc6c6eb3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #25559 from KevinGrandon/sudheesh001-apps-wallpaper

Bug 1084192 - JSHint fixes for apps/wallpaper

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https://hg.mozilla.org/integration/gaia-central/rev/d8b3f63a91b4
Author: sudheesh001 <sudheesh1995@outlook.com>
Desc: Bug 1084192 - JSHint fixes for apps/wallpaper r=djf
Bumping manifests a=b2g-bump