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

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https://hg.mozilla.org/integration/gaia-central/rev/9a8405332100
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Merge pull request #10988 from jonallengriffin/disablegridtest

Bug 892658 - Disable grid_test.js in TBPL for very frequent orange, a=te...

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https://hg.mozilla.org/integration/gaia-central/rev/56e5813a8ab9
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 892658 - Disable grid_test.js in TBPL for very frequent orange, a=test-only