Bumping gaia.json for 1 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/6dc2d3b591a6
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #12467 from EragonJ/bug-914362

Bug 914362 - fix long device name problem