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

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https://hg.mozilla.org/integration/gaia-central/rev/4188aeaa6414
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17505 from viorelaioia/bug_986462

Bug 986462 - Unxfail test_dialer_find_contact as Bug 983054 is fixed

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https://hg.mozilla.org/integration/gaia-central/rev/ecb3212a1066
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 986462 - Unxfail test_dialer_find_contact as Bug 983054 is fixed
Bumping manifests a=b2g-bump