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

https://github.com/subnut/void-packages php8.1
https://github.com/void-linux/void-packages/pull/37949

php8.1: update to 8.1.8, add changelog URL, fix manpages
The changelog URL points to the changelog for $version because the
changelog in the master branch contains the details of many alpha and RC
releases, which makes it difficult to find the changelog corresponding
to $version.

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A patch file from https://github.com/void-linux/void-packages/pull/37949.patch is attached