Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/b181a8d034ea
Author: evanxd <itoyxd@gmail.com>
Desc: Merge pull request #21331 from evanxd/bug-967216

Bug 967216 - Intermittent calendar/test/unit/app_test.js | app global events moztimechange | expected 2 to equal 1

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https://hg.mozilla.org/integration/gaia-central/rev/cd4f9c6fcef5
Author: Evan Xd <itoyxd@gmail.com>
Desc: Bug 967216 - Intermittent calendar/test/unit/app_test.js | app global events moztimechange | expected 2 to equal 1

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https://hg.mozilla.org/integration/gaia-central/rev/db186c5bdc02
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #21192 from julienw/1032327-fix-settings-unit-test-newer-mocha

Bug 1032327 - [Settings] Fix unit tests with a newer mocha r=cctuan

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https://hg.mozilla.org/integration/gaia-central/rev/ee8796cbae82
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 1032327 - [Settings] Fix unit tests with a newer mocha r=cctuan
Bumping manifests a=b2g-bump