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

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https://hg.mozilla.org/integration/gaia-central/rev/f8a6680334ee
Author: Corey Frang <gnarf37@gmail.com>
Desc: Bug 917956 - [Clock] Timer spinner allows for out-of-bound input - r=jugglinmike

- The "upper" limit of the select should be the length of values - 1 (not the length)