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/574d5e181ec8
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #16392 from AndreiH/bug_973816_2

Bug 973816 - [v1.3] Re-enable coverage for keyboard

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https://hg.mozilla.org/integration/gaia-1_3/rev/5053fd2c4b45
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 973816 - [v1.3] Re-enable coverage for keyboard