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

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https://hg.mozilla.org/integration/gaia-1_4/rev/31a38a4c6aad
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 1050861 - Use version 2.4.1 for tornado in gaia unit tests

Conflicts:
	tests/python/gaia-unit-tests/setup.py
Bumping manifests a=b2g-bump