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

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https://hg.mozilla.org/integration/gaia-central/rev/b89d5f27bc43
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #14021 from viorelaioia/bug_942824

Bug 942824 - Improve wait in test_dialer_make_call

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https://hg.mozilla.org/integration/gaia-central/rev/965da6f46d7d
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 942824 - Improve wait in test_dialer_make_call