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

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https://hg.mozilla.org/integration/gaia-central/rev/433d6612fa8b
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #15196 from viorelaioia/bug_957990

Bug 957990 - Reduce length of subject and body for test_send_xxx_email t...

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https://hg.mozilla.org/integration/gaia-central/rev/7a93320408b9
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 957990 - Reduce length of subject and body for test_send_xxx_email tests
Bumping manifests a=b2g-bump