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

========

https://hg.mozilla.org/integration/gaia-central/rev/df44abce9cf0
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #15668 from mukeshk1990/Bug_947086_Dialer_may_call_CDMA-specific_bluetooth_functions_on_non-CDMA_phone

Bug 947086 - [Dialer] Dialer may call CDMA-specific bluetooth functions r=etienne

========

https://hg.mozilla.org/integration/gaia-central/rev/4c06e7973b59
Author: mukeshk1990 <mukeshk1990@gmail.com>
Desc: Bug 947086 - [Dialer] Dialer may call CDMA-specific bluetooth functions on non-CDMA phone
Bumping manifests a=b2g-bump