Merge branch 'release' into dev

Author: rjswjddn

src/main/java/com/oronaminc/join/websocket/session/CurrentParticipantEventHandler.java

@@ -2,6 +2,7 @@
 
 import static com.oronaminc.join.global.exception.ErrorCode.*;
 
+import com.oronaminc.join.global.exception.ErrorCode;
 import java.security.Principal;
 import java.util.Set;