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

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https://hg.mozilla.org/integration/gaia-central/rev/9a92b00c78ba
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #14651 from julienw/938207-try-2

Bug 938207 - [Dialer] Intermittent Travis Unit Test Failure: dialer/call...

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https://hg.mozilla.org/integration/gaia-central/rev/1def6ed98d53
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 938207 - [Dialer] Intermittent Travis Unit Test Failure: dialer/call_log_db Two calls, same group, different hour Add a call: Error: timeout of 2000ms exceeded r=etienne

Really use a timeout of 20s now!