Issue #3303770: PHP 8.1: preg_replace(): Passing null to parameter #2 ($replacement) of type array|string is deprecated in UpdateManager.php line 129

src/UpdateManager.php

@@ -127,7 +127,7 @@ class UpdateManager {
    */
   public static function toSemanticVersion($version) {
     // Strip the 8.x prefix from the version.
-    $semantic_version = preg_replace('/^' . \Drupal::CORE_COMPATIBILITY . '-/', NULL, $version);
+    $semantic_version = preg_replace('/^' . \Drupal::CORE_COMPATIBILITY . '-/', '', $version);
 
     if (preg_match('/-dev$/', $semantic_version)) {
       return preg_replace('/^(\d).+-dev$/', '$1.x-dev', $semantic_version);