upgrade xmlsec version

pom.xml

@@ -177,14 +177,9 @@
         <logback.version>1.2.3e1</logback.version>
         <spring.security.saml2.version>2.0.0.M30</spring.security.saml2.version>
         <cache2k.version>1.2.1.Final</cache2k.version>
-        <cas.client.version>3.5.0</cas.client.version>
         <testng.version>7.3.0</testng.version>
         <xml.resolver.version>1.2</xml.resolver.version>
-        <xmlunit.version>2.1.1</xmlunit.version>
-        <cron4j.version>2.2.3</cron4j.version>
-        <!-- We can't upgrade to 5.3+ unless we get rid of EntityRegionAccessStrategy -->
-        <!-- TODO upgrade to newest 5.2.x, at least 5.2.18, see https://mvnrepository.com/artifact/org.hibernate/hibernate-core
-        probably not above 5.2 to avoid breaking code changes -->
+        <xmlunit.version>2.8.2</xmlunit.version>
         <hibernate.version>5.5.0.Final</hibernate.version>
         <!--
         Default Spring Boot 2.4.3 uses H2 1.4.200 but that one has NPE bug: