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

https://github.com/emacsomancer/void-packages mu-1.4.7
https://github.com/void-linux/void-packages/pull/22275

mu: update to 1.4.7


A patch file from https://github.com/void-linux/void-packages/pull/22275.patch is attached