There's a closed pull request on the void-packages repository

gns3-server/gns3-gui: update to 2.2.53
https://github.com/void-linux/void-packages/pull/54068

Description:
This is the latest update to the 2.2 branch of GNS3.  3.0 is the new stable release but it doubles the number of dependencies required by GNS3.  I do not plan on updating this to 3.0.  This package was almost removed from Void a few years ago and perhaps it's time.

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