Conditionally close the curl handle (#150)

`curl_close` has no effect since PHP 8.0 and is deprecated since 8.5

https://www.php.net/curl_close

Author: gsteel

MatomoTracker.php

@@ -2141,7 +2141,11 @@ protected function sendRequest(string $url, string $method = 'GET', $data = null
 
                 $this->parseIncomingCookies(explode("\r\n", $header));
             } finally {
-                curl_close($ch);
+                // curl_close has no effect since PHP 8.0
+                if (PHP_VERSION_ID < 80000) {
+                    curl_close($ch);
+                }
+
                 ob_end_clean();
             }
         } elseif (function_exists('stream_context_create')) {