tls: use SSL_get_peer_tmp_key

Both OpenSSL 1.1.1 and 3.x support SSL_get_peer_tmp_key as a replacement
for SSL_get_server_tmp_key. While the old function name still exists as
an alias, it does not accurately reflect the function's behavior
(anymore). Hence, use the new function name here.

src/crypto/crypto_common.cc

@@ -1104,7 +1104,7 @@ MaybeLocal<Object> GetEphemeralKey(Environment* env, const SSLPointer& ssl) {
 
   EscapableHandleScope scope(env->isolate());
   Local<Object> info = Object::New(env->isolate());
-  if (!SSL_get_server_tmp_key(ssl.get(), &raw_key))
+  if (!SSL_get_peer_tmp_key(ssl.get(), &raw_key))
     return scope.Escape(info);
 
   Local<Context> context = env->context();