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

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https://hg.mozilla.org/integration/gaia-central/rev/d61ac2e84b83
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #12276 from gaye/waitForAlert

Use MarionetteHelper#waitForAlert in share_url_test.js r=lightsofapollo a=test-only

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https://hg.mozilla.org/integration/gaia-central/rev/958033f9d148
Author: gaye <gaye@mozilla.com>
Desc: Use MarionetteHelper#waitForAlert in share_url_test.js r=lightsofapollo