src: register ext reference for Fingerprint512

Refs: #39809
Refs: #40239
PR-URL: #47892
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

src/crypto/crypto_x509.cc

@@ -572,6 +572,7 @@ void X509Certificate::RegisterExternalReferences(
   registry->Register(ValidFrom);
   registry->Register(Fingerprint);
   registry->Register(Fingerprint256);
+  registry->Register(Fingerprint512);
   registry->Register(KeyUsage);
   registry->Register(SerialNumber);
   registry->Register(Pem);