Add 8.4.0 release notes (#212)

Author: danirabbit

data/settings-daemon.metainfo.xml.in

@@ -32,6 +32,19 @@
   <update_contact>contact_at_elementary.io</update_contact>
 
   <releases>
+    <release version="8.4.0" date="2025-11-18" urgency="medium">
+      <description>
+        <p>Improvements:</p>
+        <ul>
+          <li>Updated translations</li>
+        </ul>
+      </description>
+      <issues>
+        <issue url="https://github.com/elementary/settings-daemon/issues/158">Introduce delay (60s) and interval (24h) for system / driver updates checks</issue>
+        <issue url="https://github.com/elementary/greeter/issues/454">Battery percentage option not synchronized between desktop and lockscreen</issue>
+      </issues>
+    </release>
+
     <release version="8.3.1" date="2025-06-11" urgency="medium">
       <description>
         <p>Improvements:</p>