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

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https://hg.mozilla.org/integration/gaia-central/rev/dd8dba4a25cb
Author: Evelyn Eastmond <evelyn@bocoup.com>
Desc: Bug 887110 - Typical clocks show quarter hours as more prominent than 10min marks

r=jugglinmike