Fix method signature

src/LastErrorException/LastErrorException.php

@@ -32,7 +32,7 @@ class LastErrorException extends ErrorException {
      *
      * @return static|null The exception or Null if no last error
      */
-    public static function createFromLastError (bool $checkErrorReporting = true): ?static {
+    public static function createFromLastError (bool $checkErrorReporting = true): ?self {
         if (($lastError = error_get_last()) === null) {
             return null;
         }