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

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https://hg.mozilla.org/integration/gaia-2_0/rev/1d1b2ce14fbf
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #20543 from julienw/1016504-call-teardown-on-mocks

Bug 1016504 - Intermittent system/test/unit/bootstrap_test.js | system/B...
(cherry picked from commit 336c30b6147cdd9122ad0b2bbffb81eb869a9ec2)
Bumping manifests a=b2g-bump