Mention in mod_mam.erl its support for XEP-0425: Message Moderation

Then run "make doap" to regenerate ejabberd.doap

ejabberd.doap

@@ -665,6 +665,15 @@
         <xmpp:note>mod_private</xmpp:note>
       </xmpp:SupportedXep>
     </implements>
+    <implements>
+      <xmpp:SupportedXep>
+        <xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0425.html"/>
+        <xmpp:version>0.2.1</xmpp:version>
+        <xmpp:since>23.04</xmpp:since>
+        <xmpp:status></xmpp:status>
+        <xmpp:note>mod_mam</xmpp:note>
+      </xmpp:SupportedXep>
+    </implements>
     <implements>
       <xmpp:SupportedXep>
         <xmpp:xep rdf:resource="https://xmpp.org/extensions/xep-0441.html"/>

src/mod_mam.erl

@@ -28,6 +28,7 @@
 -protocol({xep, 313, '0.6.1', '15.06', "", ""}).
 -protocol({xep, 334, '0.2'}).
 -protocol({xep, 359, '0.5.0'}).
+-protocol({xep, 425, '0.2.1', '23.04', "", ""}).
 -protocol({xep, 441, '0.2.0'}).
 
 -behaviour(gen_mod).