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

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https://hg.mozilla.org/integration/gaia-central/rev/6db9420083b7
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Merge pull request #11132 from jonallengriffin/handled_call

Bug 895212 - Disable handled_call_test.js for frequent TBPL orange, a=te...

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https://hg.mozilla.org/integration/gaia-central/rev/4b9a26fb6c24
Author: Jonathan Griffin <jgriffin@mozilla.com>
Desc: Bug 895212 - Disable handled_call_test.js for frequent TBPL orange, a=test-only