Fix bad merge

Author: sebastianbergmann

src/Runner/PhptTestCase.php

@@ -659,7 +659,7 @@ private function cleanupForCoverage(): RawCodeCoverageData
         }
 
         if ($buffer !== false) {
-            $coverage = @unserialize($buffer, ['allowed_class' => false]);
+            $coverage = @unserialize($buffer, ['allowed_classes' => false]);
 
             if ($coverage === false) {
                 $coverage = RawCodeCoverageData::fromXdebugWithoutPathCoverage([]);