Bump keycloak-services from 9.0.2 to 15.1.1

Bumps [keycloak-services](https://github.com/keycloak/keycloak) from 9.0.2 to 15.1.1.
- [Release notes](https://github.com/keycloak/keycloak/releases)
- [Commits](https://github.com/keycloak/keycloak/compare/9.0.2...15.1.1)

---
updated-dependencies:
- dependency-name: org.keycloak:keycloak-services
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -11,7 +11,7 @@
     <packaging>pom</packaging>
 
     <properties>
-        <version.keycloak>9.0.2</version.keycloak>
+        <version.keycloak>15.1.1</version.keycloak>
         <version.wildfly.maven.plugin>1.1.0.Final</version.wildfly.maven.plugin>
     </properties>