Mark PackageValidationArchive::$archive as `readonly`

diff --git a/wcfsetup/install/files/lib/system/package/validation/PackageValidationArchive.class.php b/wcfsetup/install/files/lib/system/package/validation/PackageValidationArchive.class.php
index 4ec4fc5ba62445ca58c7d2924d53f18266b723ff..0971895eb4a44cb346d06926a6edb4df5784c903 100644 (file)
--- a/wcfsetup/install/files/lib/system/package/validation/PackageValidationArchive.class.php
+++ b/wcfsetup/install/files/lib/system/package/validation/PackageValidationArchive.class.php
@@ -28,7 +28,7 @@ final class PackageValidationArchive implements \RecursiveIterator
     /**
      * package archive object
      */
-    private PackageArchive $archive;
+    private readonly PackageArchive $archive;
 
     /**
      * list of direct requirements delivered by this package