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

========

https://hg.mozilla.org/integration/gaia-1_2/rev/17917e945aaa
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #12949 from qdot/927642-1.2-more-tests

Bug 927642 - Readd integration tests for notification lang/direction in gaia

========

https://hg.mozilla.org/integration/gaia-1_2/rev/190f5468ee41
Author: Kyle Machulis <kyle@nonpolynomial.com>
Desc: Bug 927642 - Fix dir/lang integration tests for notifications