remove deprecated curl_close() call (PHP 8.5 deprecation)

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Problem

The curl_close() function call in src/Transport/CurlerRequest.php triggers a deprecation warning in PHP 8.5+ environments:

PHP Deprecated: Function curl_close() is deprecated since 8.5, as it has no effect since PHP 8.0

Root Cause

According to PHP documentation:

• curl_close() has had no effect since PHP 8.0
• The function is officially deprecated as of PHP 8.5
• cURL handles are automatically cleaned up when they go out of scope

Solution

Removed the unnecessary curl_close($this->handle) call from the CurlerRequest::close() method.