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

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https://hg.mozilla.org/integration/gaia-central/rev/dde3d47c81b9
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #16230 from KevinGrandon/bug_971559_system_storage_v2

Bug 971559 - [System2] Instantiable Storage r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/9b58b27a44bb
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 971559 - [System2] Instantiable Storage r=alive
Bumping manifests a=b2g-bump