Prepare metainfo for release v7.3.0 (#2686)

Author: jeremypw

data/files.metainfo.xml.in.in

@@ -62,6 +62,22 @@
   <update_contact>contact_at_elementary.io</update_contact>
 
   <releases>
+    <release version="7.3.0" date="2025-12-26" urgency="medium">
+      <description>
+        <p>Improvements:</p>
+        <ul>
+          <li>An option to show a preview pane in Column view is introduced</li>
+        </ul>
+        <p>Minor updates:</p>
+        <ul>
+          <li>Updated translations</li>
+        </ul>
+      </description>
+      <issues>
+        <issue url="https://github.com/elementary/files/issues/1601">(Mixed mode) clicking on a file should open its details in the next column</issue>
+        <issue url="https://github.com/elementary/files/issues/2672">Searching for a file in the current folder and moving it elsewhere results in a File not Found screen</issue>
+      </issues>
+    </release>
     <release version="7.2.0" date="2025-12-08" urgency="medium">
       <description>
         <p>Improvements:</p>