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

https://github.com/skmpz/void-packages libcap-2.45
https://github.com/void-linux/void-packages/pull/26129

libcap: update to 2.45.
Built for: 
- x86_64 [x86_64]
- i686 [i686]
- aarch64 [x86_64]
- armv7l [x86_64]
- x86_64-musl [x86_64-musl]
- aarch64-musl [x86_64-musl]
- armv6l-musl [x86_64-musl]

A patch file from https://github.com/void-linux/void-packages/pull/26129.patch is attached