nixos/tests/php: Declare php package used instead of just using default

nixos/tests/php/pcre.nix

@@ -1,7 +1,7 @@
 let
   testString = "can-use-subgroups";
-in import ../make-test-python.nix ({lib, ...}: {
-  name = "php-httpd-pcre-jit-test";
+in import ../make-test-python.nix ({lib, php, ...}: {
+  name = "php-${php.version}-httpd-pcre-jit-test";
   meta.maintainers = lib.teams.php.members;
 
   machine = { lib, pkgs, ... }: {
@@ -9,6 +9,7 @@ in import ../make-test-python.nix ({lib, ...}: {
     services.httpd = {
       enable = true;
       adminAddr = "please@dont.contact";
+      phpPackage = php;
       enablePHP = true;
       phpOptions = "pcre.jit = true";
       extraConfig = let