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

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https://hg.mozilla.org/integration/gaia-central/rev/cff886cd8e29
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17729 from KevinGrandon/bug_989065_wifi_test_sandbox

Bug 989065 - [System] Fix wifi_test.js when run in its own sandbox r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/128d032e3429
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 989065 - [System] Fix wifi_test.js when run in its own sandbox
Bumping manifests a=b2g-bump