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

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https://hg.mozilla.org/integration/gaia-central/rev/be3c9b76d295
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20904 from EverythingMe/1029016-grid-zindex

Bug 1029016 - [Collection app] Can't interact with pinned apps when loading web results

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https://hg.mozilla.org/integration/gaia-central/rev/dbb658bab1bb
Author: Ran Ben Aharon <ran@ranbena.com>
Desc: Bug 1029016 - [Collection app] Can't interact with pinned apps when loading web results
Bumping manifests a=b2g-bump