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

========

https://hg.mozilla.org/integration/gaia-central/rev/c37b329da48f
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #23597 from dominickuo/bug-1032675-reland

Bug 1032675 - [System] upgrade the new default tones for OTA, r=timdream

========

https://hg.mozilla.org/integration/gaia-central/rev/c7faf529bc62
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1032675 - [System] upgrade the new default tones for OTA
Bumping manifests a=b2g-bump