Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/77aab31a8dfd
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #26676 from Cwiiis/bug1105850-highlight-hovered-group

Bug 1105850 - Highlight the group being hovered over in edit mode. r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/29c79f043365
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1105850 - Test that hovered groups are highlighted. r=crdlc

Make sure that when hovering an item over a group, it gets highlighted.

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https://hg.mozilla.org/integration/gaia-central/rev/7b7718b5c44b
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1105850 - Highlight the group being hovered over in edit mode. r=crdlc
Bumping manifests a=b2g-bump