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

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https://hg.mozilla.org/integration/gaia-central/rev/b9baa6447fd7
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15258 from viorelaioia/bug_959182

Bug 959182 - Xfail test_sms_with_attachments

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https://hg.mozilla.org/integration/gaia-central/rev/04e333efac57
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 959182 - Xfail test_sms_with_attachments