[github ci] Build also with Java 21

smack-legacy/src/main/java/org/jivesoftware/smackx/workgroup/packet/DepartQueuePacket.java

@@ -53,6 +53,7 @@ public class DepartQueuePacket extends IQ {
      * @param workgroup the workgroup to depart.
      * @param user the user to make depart from the queue.
      */
+    @SuppressWarnings("this-escape")
     public DepartQueuePacket(EntityBareJid workgroup, EntityJid user) {
         super("depart-queue", "http://jabber.org/protocol/workgroup");
         this.user = user;

smack-legacy/src/main/java/org/jivesoftware/smackx/workgroup/settings/ChatSetting.java

@@ -22,6 +22,7 @@ public class ChatSetting {
     private String value;
     private int type;
 
+    @SuppressWarnings("this-escape")
     public ChatSetting(String key, String value, int type) {
         setKey(key);
         setValue(value);

smack-legacy/src/main/java/org/jivesoftware/smackx/workgroup/settings/ChatSettings.java

@@ -66,6 +66,7 @@ public class ChatSettings extends IQ {
         settings = new ArrayList<>();
     }
 
+    @SuppressWarnings("this-escape")
     public ChatSettings(String key) {
         this();
         setKey(key);

smack-legacy/src/main/java/org/jivesoftware/smackx/workgroup/user/Workgroup.java

@@ -99,6 +99,7 @@ public class Workgroup {
      * @param connection   an XMPP connection which must have already undergone a
      *                     successful login.
      */
+    @SuppressWarnings("this-escape")
     public Workgroup(EntityBareJid workgroupJID, XMPPConnection connection) {
         // Login must have been done before passing in connection.
         if (!connection.isAuthenticated()) {

smack-legacy/src/main/java/org/jivesoftware/smackx/xroster/packet/RosterExchange.java

@@ -70,6 +70,7 @@ public class RosterExchange implements ExtensionElement {
      *
      * @param roster the roster to send to other XMPP entity.
      */
+    @SuppressWarnings("this-escape")
     public RosterExchange(Roster roster) {
         // Add all the roster entries to the new RosterExchange
         for (RosterEntry rosterEntry : roster.getEntries()) {