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

========

https://hg.mozilla.org/integration/gaia-central/rev/988162005143
Author: dwi2 <dwi2@dwi2.com>
Desc: Merge pull request #22664 from dwi2/bug1047275

Bug 1047275 - Test ellipsis side on RTL pages for FontSizeManager r=drs

========

https://hg.mozilla.org/integration/gaia-central/rev/7b471c0df360
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1047275 - Test ellipsis side on RTL pages for FontSizeManager
Bumping manifests a=b2g-bump