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

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https://hg.mozilla.org/integration/gaia-central/rev/089e712b0ed6
Author: Rex KM Lee <rexboy@mozilla.com>
Desc: Merge pull request #10976 from rexboy7/fix-bug882056

Bug 882056 - [Dialer] Single call on hold can only be performed from BT devices

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https://hg.mozilla.org/integration/gaia-central/rev/be445a6bf681
Author: Rex Lee <rexboy@mozilla.com>
Desc: Bug 882056 - [Dialer] Single call on hold can only be performed from BT devices