Update pac4j.version to v5.7.9

Author: renovate[bot]

pom.xml

@@ -30,7 +30,7 @@
         <java.version>11</java.version>
         <spring-webflux-pac4j.version>1.2.0</spring-webflux-pac4j.version>
         <spring-security-pac4j.version>8.0.0</spring-security-pac4j.version>
-        <pac4j.version>5.7.8</pac4j.version>
+        <pac4j.version>5.7.9</pac4j.version>
     </properties>
 
     <dependencies>