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

========

https://hg.mozilla.org/integration/gaia-central/rev/89233b5bc8cd
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #20882 from crdlc/bug-1028841

Bug 1028841 - [Vertical Homescreen] Last divider is visible in normal mo...

========

https://hg.mozilla.org/integration/gaia-central/rev/efe716690e6a
Author: crdlc <crdlc@tid.es>
Desc: Bug 1028841 - [Vertical Homescreen] Last divider is visible in normal mode sometimes
Bumping manifests a=b2g-bump