Fix Licenses pom metadata

See:
 - https://maven.apache.org/pom.html#licenses
 - https://gitlab.eclipse.org/eclipsefdn/emo-team/sbom/-/blob/main/docs/sbom.adoc#sbom-maven-practices

pom.xml

@@ -28,14 +28,9 @@ Contributors:
     <description>An OMA Lightweight M2M (LWM2M) implementation in Java</description>
     <licenses>
         <license>
-            <name>Eclipse Public License (EPL), Version 2.0</name>
-            <url>http://www.eclipse.org/legal/epl-v20.html</url>
-            <distribution>repo</distribution>
-        </license>
-        <license>
-            <name>Eclipse Distribution License (EDL), Version 1.0</name>
-            <url>http://www.eclipse.org/org/documents/edl-v10.html</url>
+            <name>EPL-2.0 OR BSD-3-Clause</name>
             <distribution>repo</distribution>
+            <comments>Leshan is dual-licensed under the Eclipse Public License v2.0 and Eclipse Distribution License v1.0. A consumer can choose between that 2 licenses.</comments>
         </license>
     </licenses>