Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/9f8dd5b9a6dc
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Merge pull request #12020 from jonallengriffin/disablewifi

Bug 914038 - Disable test_wifi.js in TBPL, a=test-only

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https://hg.mozilla.org/integration/gaia-central/rev/e02d8c855908
Author: Jonathan Griffin <jonallengriffin@gmail.com>
Desc: Bug 914038 - Disable test_wifi.js in TBPL, a=test-only