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

========

https://hg.mozilla.org/integration/gaia-1_4/rev/616a6b9f03dc
Author: AndreiH <andrei.hutusoru@softvision.ro>
Desc: Merge pull request #17750 from chirarobert/uplift_call_contact_fix

Bug 988754 - Fix test_call_contact.py

========

https://hg.mozilla.org/integration/gaia-1_4/rev/a3b9f2a832fe
Author: askeing <askeing@gmail.com>
Desc: Bug 988754 - Fix test_call_contact.py
Bumping manifests a=b2g-bump