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

========

https://hg.mozilla.org/integration/gaia-central/rev/1cc8e7afb2c2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18714 from KevinGrandon/bug_971539_system2_places

[System2] Make Places instantiable, add JSDoc comments

========

https://hg.mozilla.org/integration/gaia-central/rev/5560a534ed23
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: [System2] Make Places instantiable, add JSDoc comments r=alive, daleharvey
Bumping manifests a=b2g-bump