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

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https://hg.mozilla.org/integration/gaia-1_3/rev/4a5a0bcead13
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #14756 from julienw/936369-fix-keyboard-manager

a=tests

Bug 936369 - [system] Intermittent Travis Unit Test Failure: KeyboardMan...
(cherry picked from commit ecf64f1c4bbbe48b0570fabee708d514872cb50b)

Conflicts:
	apps/system/test/unit/keyboard_manager_test.js