remove curl_close as it has no effect since php8.0 (https://www.php.net/manual/en/function.curl-close.php)

src/StaticMap/src/Image.php

@@ -306,8 +306,6 @@ class Image {
             throw new \Exception(\curl_error($curl));
         }
 
-        \curl_close($curl);
-
         if ($image === false) {
             return $this->resetFields();
         }