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

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https://hg.mozilla.org/integration/gaia-central/rev/7d7b66eaa2a6
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Merge pull request #11079 from jonallengriffin/bug895978

Bug 895978 - Disable thread_ui_test.js in TBPL for frequent orange, a=te...

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https://hg.mozilla.org/integration/gaia-central/rev/d3ff3ef49185
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 895978 - Disable thread_ui_test.js in TBPL for frequent orange, a=test-only