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

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https://hg.mozilla.org/integration/gaia-1_2/rev/e5f4453b3d98
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #14230 from bobsilverberg/tbpl_contact_input

Bug 934446 - Test Messages contact input validation

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https://hg.mozilla.org/integration/gaia-1_2/rev/25303ccdc2db
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Bug 934446 - Test Messages contact input validation
Enabling the test on tbpl for v1.2