Use HTTPS for AMFPHP requests

This was a bit trickier to figure out how to upgrade, it's not in the `xmlrpc` package's README, but I found the answer here: https://github.com/baalexander/node-xmlrpc/issues/142

src/server/types/Pet.js

@@ -141,9 +141,8 @@ const resolvers = {
   },
 };
 
-const neopetsXmlrpcClient = xmlrpc.createClient({
+const neopetsXmlrpcClient = xmlrpc.createSecureClient({
   host: "www.neopets.com",
-  port: 80,
   path: "/amfphp/xmlrpc.php",
 });
 const neopetsXmlrpcCall = util