Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/a05c83b2aae8
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Merge pull request #24057 from Cwiiis/proto-grouping-2

Bug 1067435 - Homescreen grouping. r=crdlc,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/4491708ffc73
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1067435 - Add a setting for homescreen app-grouping. r=kgrandon,crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/33c19e40a2d7
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1067435 - Add unit tests for GaiaGrid group feature. r=kgrandon,crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/f41adb6b643e
Author: Chris Lord <chrislord.net@gmail.com>
Desc: Bug 1067435 - Homescreen grouping. r=crdlc,kgrandon

Everything is in a group, dividers act as group separators.

Features:
- Rearranging groups
- Expanding/collapsing groups
- Creating new groups between groups
- Saving/restoring collapsed state
Bumping manifests a=b2g-bump