Use SPDX for Maven license tag

That's recommended by Maven and by Eclipse EMO:
* https://maven.apache.org/pom.html#Licenses
* https://gitlab.eclipse.org/eclipsefdn/emo-team/sbom/-/blob/main/docs/sbom.adoc

Change-Id: I771bb4a1dbfb38e757efe0c8a8f84f861753146b

pom.xml

diff --git a/pom.xml b/pom.xml
index fb1661c..73c8919 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,7 +40,8 @@
 
   <licenses>
     <license>
-      <name>Eclipse Public License 2.0</name>
+      <name>EPL-2.0</name>
+      <url>https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt</url>
       <comments>
        All rights reserved.