There is an updated pull request by ar-jan against master on the void-packages repository

https://github.com/ar-jan/void-packages proj-721
https://github.com/void-linux/void-packages/pull/40347

proj: update to 9.1.0
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Followup to #31687.

Depends on #40423 being merged first because vtk update has shlib dependents.

A patch file from https://github.com/void-linux/void-packages/pull/40347.patch is attached