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

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https://hg.mozilla.org/integration/gaia-1_2/rev/101a737b028b
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 939979 - Unxfail test_context_menu_activity_picker.py
Conflicts:
	tests/python/gaia-ui-tests/gaiatest/tests/functional/system/manifest.ini