Bumping gaia.json for 1 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/73cf78ae2dba
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #15284 from EragonJ/bug-956424

Bug 956424 - SIM Security enabled/disabled information is wrong