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

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https://hg.mozilla.org/integration/gaia-central/rev/cc6b6bcc278e
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: Bug 903260 fixes tests, a=test-only

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