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

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https://hg.mozilla.org/integration/gaia-1_4/rev/505388cd92eb
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #19933 from EragonJ/bug-1014455

Bug 1014455 - The icons in SIM manager are incorrectly displayed r=Arthur
Bumping manifests a=b2g-bump