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

========

https://hg.mozilla.org/integration/gaia-central/rev/6f63b10d567e
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #21601 from dominickuo/bug-1036402

Bug 1036402 - [System] Only change the SCO volume when SCO is connected, r=alivedise

========

https://hg.mozilla.org/integration/gaia-central/rev/3f82cab4bbed
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1036402 - [System] Only change the SCO volume when SCO is connected
Bumping manifests a=b2g-bump