fix: keycloak-plugins/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGKEYCLOAK-7268350

Author: snyk-bot

keycloak-plugins/pom.xml

@@ -61,7 +61,7 @@
 
         <pmdVersion>6.17.0</pmdVersion>
 
-        <keycloak.version>21.0.0</keycloak.version>
+        <keycloak.version>25.0.3</keycloak.version>
         <checkStyleLocation>../analizers</checkStyleLocation>
         <pmdLocation>${basedir}/../analizers/</pmdLocation>
         <findBugsLocation>${basedir}/../analizers/</findBugsLocation>
@@ -251,7 +251,7 @@
                                 <Multi-Release>true</Multi-Release>
                             </manifestEntries>
                         </transformer>
-                        <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
+                        <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                     </transformers>
                 </configuration>
                 <executions>