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

https://github.com/emacsomancer/void-packages mu-1.4.14
https://github.com/void-linux/void-packages/pull/27644

mu: update to 1.4.14
https://github.com/djcb/mu/releases/tag/1.4.14

A patch file from https://github.com/void-linux/void-packages/pull/27644.patch is attached