There's a merged pull request on the void-packages repository

ncurses: update to 6.4.
https://github.com/void-linux/void-packages/pull/42169

Description:
#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture: **x86_64**

I have been using this (ncurses, ncurses-base, & ncurses-libs) for ~5 days without any noticeable issues.