Bump keycloak-services from 13.0.1 to 15.1.1 (#7)

Bumps [keycloak-services](https://github.com/keycloak/keycloak) from 13.0.1 to 15.1.1.
- [Release notes](https://github.com/keycloak/keycloak/releases)
- [Commits](keycloak/keycloak@13.0.1...15.1.1)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -62,7 +62,7 @@
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
 
-        <keycloak.version>13.0.1</keycloak.version>
+        <keycloak.version>15.1.1</keycloak.version>
 
         <!-- test dependencies versions -->
         <assertj.version>3.19.0</assertj.version>