nixos/snipe-it: Use the pinned PHP package

As 3bb3859 bumped the default PHP version to 8.2, the snipe-it package
has been pinned to PHP 8.1. This commit changes the php package used in
the module to the one pinned by snipe-it.

nixos/modules/services/web-apps/snipe-it.nix

@@ -15,6 +15,8 @@ let
 
   tlsEnabled = cfg.nginx.addSSL || cfg.nginx.forceSSL || cfg.nginx.onlySSL || cfg.nginx.enableACME;
 
+  inherit (snipe-it.passthru) phpPackage;
+
   # shell script for local administration
   artisan = pkgs.writeScriptBin "snipe-it" ''
     #! ${pkgs.runtimeShell}
@@ -23,7 +25,7 @@ let
     if [[ "$USER" != ${user} ]]; then
       sudo='exec /run/wrappers/bin/sudo -u ${user}'
     fi
-    $sudo ${pkgs.php}/bin/php artisan $*
+    $sudo ${phpPackage}/bin/php artisan $*
   '';
 in {
   options.services.snipe-it = {
@@ -340,8 +342,7 @@ in {
     };
 
     services.phpfpm.pools.snipe-it = {
-      inherit user group;
-      phpPackage = pkgs.php81;
+      inherit user group phpPackage;
       phpOptions = ''
         post_max_size = ${cfg.maxUploadSize}
         upload_max_filesize = ${cfg.maxUploadSize}
@@ -450,7 +451,7 @@ in {
           rm "${cfg.dataDir}"/bootstrap/cache/*.php || true
 
           # migrate db
-          ${pkgs.php}/bin/php artisan migrate --force
+          ${phpPackage}/bin/php artisan migrate --force
 
           # A placeholder file for invalid barcodes
           invalid_barcode_location="${cfg.dataDir}/public/uploads/barcodes/invalid_barcode.gif"