Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/a183b055417d
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 909641 - Re-enable SMS UI Thread Test (fails on CI)

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>