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

https://github.com/ahesford/void-packages matplotlib
https://github.com/void-linux/void-packages/pull/25055

python3-matplotlib: update to 3.3.2, drop python3-matplotlib-data


A patch file from https://github.com/void-linux/void-packages/pull/25055.patch is attached