[MRESOLVER-577] Update to Maven 3.9.8

Used by supplier and demos.

---

https://issues.apache.org/jira/browse/MRESOLVER-577

Author: cstamas

pom.xml

@@ -104,7 +104,7 @@
     <!-- Used by Jetty Transport (client) and Test HTTP (server) -->
     <jettyVersion>10.0.21</jettyVersion>
     <!-- used by supplier and demo only -->
-    <maven3Version>3.9.6</maven3Version>
+    <maven3Version>3.9.8</maven3Version>
     <maven4Version>4.0.0-beta-3</maven4Version>
     <minimalMavenBuildVersion>[3.8.8,)</minimalMavenBuildVersion>
     <!-- MRESOLVER-422: keep this in sync with Javadoc plugin configuration (but cannot directly, as this below is range) -->