chore: add security ruleset to PMD (TheAlgorithms#6292)

Author: vil02

pom.xml

@@ -145,6 +145,7 @@
                 <configuration>
                     <rulesets>
                         <ruleset>/rulesets/java/maven-pmd-plugin-default.xml</ruleset>
+                        <ruleset>/category/java/security.xml</ruleset>
                         <ruleset>file://${basedir}/pmd-custom_ruleset.xml</ruleset>
                     </rulesets>
                     <printFailingErrors>true</printFailingErrors>