SSL bulunduran sitelerde curl ile bağlantı yaparken SSL doğrulamasını pasif yapmalısınız.

CURLOPT_SSL_VERIFYPEER => false
Son hali;

$curl = curl_init();
curl_setopt_array($curl, [
   
    CURLOPT_URL => 'https://www.hepsiburada.com/kampanyalar/cok-satan-kitaplar',
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_SSL_VERIFYPEER => false,
    CURLOPT_REFERER => "https://google.com.tr/",
    CURLOPT_USERAGENT => "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36"
   
]);
   
$cek = curl_exec($curl);
$cek = preg_replace("/\s+/", " ", $cek);
   
preg_match_all('@<div class="box product" data-bind="(.*?)">(.*?)</div>@si', $cek, $sonuc);
  
   
curl_close($curl);
   
echo"<pre>";
print_r($sonuc);
echo "</pre>";