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

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https://hg.mozilla.org/integration/gaia-central/rev/cb66994a0ba3
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #19763 from steveck-chung/bug-1009098

Bug 1009098 - [Messages] The composer is displayed in the edit mode, r=azasypkin

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https://hg.mozilla.org/integration/gaia-central/rev/89007cdf166d
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 1009098 - [Messages] The composer is displayed in the edit mode
Bumping manifests a=b2g-bump