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/4891da563a2d
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #16448 from AndreiH/bug974343

Bug 974343 - Unxfail test_ftu_skip_tour.py on v1.3, bug 965912 is fixed

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https://hg.mozilla.org/integration/gaia-1_3/rev/680ad79fa60c
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 974343 - Unxfail test_ftu_skip_tour.py on v1.3, bug 965912 is fixed