fix: SASL SCRAM-SHA-{256,512} should now work

example/lib/main.dart

@@ -78,6 +78,7 @@ class _MyHomePageState extends State<MyHomePage> {
         CSINegotiator(),
         RosterFeatureNegotiator(),
         SaslPlainNegotiator(),
+        SaslScramNegotiator(10, '', '', ScramHashType.sha512),
         SaslScramNegotiator(9, '', '', ScramHashType.sha256),
         SaslScramNegotiator(8, '', '', ScramHashType.sha1),
       ]);