Exclude oracle.ucp.util.OpaqueString (#8609)

Jira ticket: APPSEC-57044

Author: jandro996

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

@@ -226,6 +226,8 @@
 # APPSEC-57044
 1 oracle.security.o5logon.O5Logon
 1 oracle.sql.*
+# APPSEC-57044
+1 oracle.ucp.util.OpaqueString
 1 org.ajax4jsf.*
 1 org.aopalliance.*
 1 org.antlr.*