Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/773bc13adf6e
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #18556 from yurenju/l10n

Bug 968666 - multilocale.js should be a standalone build script which ca... r=@ochameau f=@Pike

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https://hg.mozilla.org/integration/gaia-central/rev/6d7b4c42d433
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 968666 - multilocale.js should be a standalone build script which can be executed by macro |run-js-command|

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https://hg.mozilla.org/integration/gaia-central/rev/246958d3bbb2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1005272 - Disable intermittent failing test, test_settings_change_keyboard_language.py
Bumping manifests a=b2g-bump