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

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https://hg.mozilla.org/integration/gaia-central/rev/32137585357b
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13387 from zacc/bug_935052_phone

bug 935052 - fall back to top-most frame after closing call in dialer te...

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https://hg.mozilla.org/integration/gaia-central/rev/23c37e4351af
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: bug 935052 - fall back to top-most frame after closing call in dialer tests