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

https://github.com/daniel-eys/void-packages bash-completion
https://github.com/void-linux/void-packages/pull/11547

bash-completion: update to 2.9.
* updated to latest version
* removed `post_install()` as this was fixed upstream

A patch file from https://github.com/void-linux/void-packages/pull/11547.patch is attached