Bumping gaia.json for 2 gaia-1_3 revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-1_3/rev/532bcd83d9d0
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #16421 from fabi1cazenave/smsUpdateThread-bug968815-v1.3

Bug 968815, uplift to v1.3

========

https://hg.mozilla.org/integration/gaia-1_3/rev/e2ae2a9d83a5
Author: Fabien Cazenave <fabien@mozilla.com>
Desc: Merge pull request #16247 from fabi1cazenave/smsUpdateThread-bug968815

Bug 968815 - [SMS] update thread when last message is deleted, r=julienw
(cherry picked from commit 988c320bccfa7f873dc2ef3e7c34a11a9f4ad409)