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

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https://hg.mozilla.org/integration/gaia-central/rev/5bd5379f114f
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 980461 - [MMS] Visual adjustments to attachment download indicator (follow-up) r=me

As said by Francesco Lodolo, we should always use the unicode character for "...".
Bumping manifests a=b2g-bump