Revert to using php-builder for PHP 8.3 and above for self-hosted

Author: shivammathur

src/scripts/unix.sh

@@ -4,7 +4,7 @@ export cross="✗"
 export curl_opts=(-sL)
 export old_versions="5.[3-5]"
 export jit_versions="8.[0-9]"
-export nightly_versions="8.[6-9]"
+export nightly_versions="8.[3-9]"
 export xdebug3_versions="7.[2-4]|8.[0-9]"
 export latest="releases/latest/download"
 export github="https://github.com/shivammathur"