Fix weak randomness false positive in Kafka client (#8408)

Author: smola

dd-java-agent/instrumentation/iast-instrumenter/src/main/resources/datadog/trace/instrumentation/iastinstrumenter/iast_exclusion.trie

@@ -134,6 +134,8 @@
 1 gnu.*
 1 graphql.*
 1 ibm.security.*
+# APPSEC-56801
+1 io.confluent.kafka.schemaregistry.client.rest.utils.UrlList
 1 io.dropwizard.*
 2 io.ebean.*
 2 io.ebeaninternal.*