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

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https://hg.mozilla.org/integration/gaia-1_3/rev/376934c039d5
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #16246 from chirarobert/v1.3_xfail_cost_control

Xfail test_cost_control_data_alert_mobile.py because of Bug 971696 - [v1...

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https://hg.mozilla.org/integration/gaia-1_3/rev/fa6628adf90b
Author: chirarobert <chirarobert@yahoo.com>
Desc: Xfail test_cost_control_data_alert_mobile.py because of Bug 971696 - [v1.3][Cost Control] No data usage is available in notification bar or app