Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/ebdeab7ec302
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #12467 from EragonJ/bug-914362

Bug 914362 - fix long device name problem

========

https://hg.mozilla.org/integration/gaia-central/rev/8d688a8a338b
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 914362 - fix long device name problem

- add middle ellipsis symbols for this case