Fix benchmarks after #3444 (#3476)

Author: a-TODO-rov

src/test/jmh/io/lettuce/core/EmptyStatefulRedisConnection.java

@@ -11,6 +11,7 @@
 import io.lettuce.core.api.sync.RedisCommands;
 import io.lettuce.core.protocol.ConnectionFacade;
 import io.lettuce.core.protocol.RedisCommand;
+import io.lettuce.core.codec.RedisCodec;
 
 /**
  * @author Mark Paluch
@@ -58,6 +59,11 @@ public ClientOptions getOptions() {
         return null;
     }
 
+    @Override
+    public RedisCodec getCodec() {
+        return null;
+    }
+
     @Override
     public void activated() {
     }