ENGCOM-9192: Replaced PHP8-only str_contains method. #33886

 - Merge Pull Request #33886 from reense/magento2:patch-5
 - Merged commits:
   1. 055d9fc
   2. 5888eea
   3. cda98b5
   4. b72097d

Author: magento-engcom-team

lib/internal/Magento/Framework/Filesystem/Directory/DenyListPathValidator.php

@@ -71,7 +71,7 @@ public function validate(
 
         foreach ($this->fileDenyList as $file) {
             $baseName = pathinfo($actualPath, PATHINFO_BASENAME);
-            if (str_contains($baseName, $file) || preg_match('#' . "\." . $file . '#', $fullPath)) {
+            if (strpos($baseName, $file) !== false || preg_match('#' . "\." . $file . '#', $fullPath)) {
                 throw new ValidatorException(
                     new Phrase('"%1" is not a valid file path', [$path])
                 );