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

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https://hg.mozilla.org/integration/gaia-central/rev/3a9996ce4209
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #20770 from KevinGrandon/bug_1025963_collections_pinned_edit

Bug 1025963 - [Collection app] Pinned apps edit mode

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https://hg.mozilla.org/integration/gaia-central/rev/4fb32c97478f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1025963 - [Collection app] Pinned apps edit mode r=crdlc
Bumping manifests a=b2g-bump