pom.xml: update xrootd4j (4.5.3, etc.)

See https://rb.dcache.org/r/13800/
xrootd4j: support kXR_prefname in kXR_locate request

Target: master (v4.5.3)
Request: 8.2 (v4.5.3)
Request: 8.1 (v4.3.5)
Request: 8.0 (v4.2.9)
Request: 7.2 (v4.2.9)
Patch: https://rb.dcache.org/r/13808/
Requires-notes: yes
Acked-by: Lea

pom.xml

@@ -68,7 +68,7 @@
         <version.smc>6.6.0</version.smc>
         <version.xerces>2.12.0</version.xerces>
         <version.jetty>9.4.43.v20210629</version.jetty>
-        <version.xrootd4j>4.2.8</version.xrootd4j>
+        <version.xrootd4j>4.2.9</version.xrootd4j>
         <version.jersey>2.28</version.jersey>
         <version.dcache-view>2.0.2</version.dcache-view>
         <version.netty>4.1.59.Final</version.netty>