Update dependency org.pac4j:pac4j-core to v6.3.1

Author: renovate[bot]

pom.xml

@@ -66,7 +66,7 @@
     </developers>
 
     <properties>
-        <pac4j.version>6.3.0</pac4j.version>
+        <pac4j.version>6.3.1</pac4j.version>
         <java.version>17</java.version>
         <ratpack.version>1.9.0</ratpack.version>
     </properties>