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

========

https://hg.mozilla.org/integration/gaia-central/rev/e97bf117dd1e
Author: steveck-chung <schung@mozilla.com>
Desc: Merge pull request #18363 from steveck-chung/bug-992233

Bug 992233 - 984153 regressed the background color for suggestions list. r=julienw

========

https://hg.mozilla.org/integration/gaia-central/rev/b4768931387d
Author: Steve Chung <schung@mozilla.com>
Desc: Bug 992233 - 984153 regressed the background color for suggestions list
Bumping manifests a=b2g-bump