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

========

https://hg.mozilla.org/integration/gaia-central/rev/eac38252f1a0
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15475 from etiennesegonzac/bug-949225-dsds-conn-check

Bug 949225 - Check the mozMobileConnection in a DSDS compatible way in TelephonyHelper. r=rik

========

https://hg.mozilla.org/integration/gaia-central/rev/1b822eed6e06
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 949225 - Check the mozMobileConnection in a DSDS compatible way in TelephonyHelper.
r=rik
Bumping manifests a=b2g-bump