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

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https://hg.mozilla.org/integration/gaia-2_0/rev/50d780b14568
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #21665 from EragonJ/bug-1035823

Bug 1035823 - [DSDS] The SIM manager page is not refreshed if configurat...
Bumping manifests a=b2g-bump