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

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https://hg.mozilla.org/integration/gaia-central/rev/08fdb9ce78d8
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #23503 from daleharvey/1054466

Bug 1054466 - Restore overflow menu via contextmenu. r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/b93d7a1f808c
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1054466 - Restore overflow menu via contextmenu. r=kgrandon
Bumping manifests a=b2g-bump