Fix deprecated curl_close() warning on PHP 8.5+

[semhoun]

Summary

Fixes the deprecation warning Function curl_close() is deprecated since 8.5, as it has no effect since PHP 8.0 that appears when running on PHP 8.5 or higher.

Problem

Since PHP 8.0, cURL handles (CurlHandle objects) are automatically closed when they are no longer referenced or when the script ends. The explicit curl_close() function call became redundant.

In PHP 8.5, curl_close() is officially deprecated and emits a warning:

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

Solution

Add a version check to only call curl_close() on PHP versions older than 8.0:

public function close(CurlHandle $handle): void
{
    if (\PHP_VERSION_ID < 80000) {
        curl_close($handle);
    }
}

Backward Compatibility

This change maintains full backward compatibility:

PHP Version	Behavior
PHP < 8.0	curl_close() is called as before (required for resource cleanup)
PHP 8.0 - 8.4	No-op (handles auto-close, no deprecation warning)
PHP 8.5+	No-op (avoids deprecation warning, handles auto-close)

[vjik]

@semhoun Thanks for contribute!