Fix merge error, update stubs hash

Author: StephenWall

ext/openssl/openssl.stub.php

@@ -486,7 +486,7 @@ function openssl_csr_export(OpenSSLCertificateSigningRequest|string $csr, &$outp
 /**
  * @param OpenSSLAsymmetricKey|OpenSSLCertificate|array|string $private_key
  */
-function openssl_csr_sign(OpenSSLCertificateSigningRequest|string $csr, OpenSSLCertificate|string|null $ca_certificate, #[\SensitiveParameter] $private_key, int|array $validity, ?array $options = null, int $serial = 0): OpenSSLCertificate|false {}
+function openssl_csr_sign(OpenSSLCertificateSigningRequest|string $csr, OpenSSLCertificate|string|null $ca_certificate, #[\SensitiveParameter] $private_key, int|array $validity, ?array $options = null, int $serial = 0, ?string $serial_hex = null): OpenSSLCertificate|false {}
 
 /**
  * @param OpenSSLAsymmetricKey|null $private_key