Missing fileinfo and simplexml extensions

It looks like the packages fileinfo and simplexml are missing.

Note that they are available here, but are compiled against a different version of PHP 8.1.x"

- https://pkgs.alpinelinux.org/package/edge/testing/x86_64/php81-simplexml
- https://pkgs.alpinelinux.org/package/edge/testing/x86_64/php81-fileinfo