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

========

https://hg.mozilla.org/integration/gaia-central/rev/f1f04d6c6f24
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #18280 from anefzaoui/issue-985849

 Bug 985849 - [Settings] Add icons to Volume adjustment Seek Bar r=crh0716

========

https://hg.mozilla.org/integration/gaia-central/rev/71160bb27b14
Author: anefzaoui <nefzaoui.ahmed@hotmail.com>
Desc:  Bug 985849 - [Settings] Add icons to Volume adjustment Seek Bar
Bumping manifests a=b2g-bump