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

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https://hg.mozilla.org/integration/gaia-central/rev/b0f7b5c700a9
Author: Rick Waldron <waldron.rick@gmail.com>
Desc: "spec" => "Spec" to unbreak make test-agent-test

Fixes typo introduced here cf5fd449a4d5db36fda097e513810d2350c26f0b

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