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

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https://hg.mozilla.org/integration/gaia-2_1/rev/962fbf46f61c
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #24319 from EragonJ/bug-1071387

Bug 1071387 - [Settings] STK icons are missing and SIM labels is above o...
Bumping manifests a=b2g-bump