There is a new pull request by jnbr against master on the void-packages repository

https://github.com/jnbr/void-packages imagemagick
https://github.com/void-linux/void-packages/pull/13278

 ImageMagick: update to 7.0.8.56. 


A patch file from https://github.com/void-linux/void-packages/pull/13278.patch is attached