Replaced PHP8-only str_contains method

Update patch to be equal to the hotfix in
https://support.magento.com/hc/en-us/articles/4408021533069-Adobe-Commerce-upgrade-2-4-3-2-3-7-p1-PHP-Fatal-error-Hotfix

Author: ihor-sviziev

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 ('' === $file || false !== strpos($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])
                 );