Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/4e9e8ac458cd
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #13449 from bobsilverberg/bug935603

bug 935603 - Intermittent test_settings_change_keyboard_language.py, wait for checkbox to be properly selected, a=test_only

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https://hg.mozilla.org/integration/gaia-1_2/rev/0f691356a116
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: bug 935603 - Intermittent test_settings_change_keyboard_language.py, wait for checkbox to be properly selected