chore(deps): bump org.keycloak:keycloak-admin-client in /backend

Bumps org.keycloak:keycloak-admin-client from 23.0.7 to 25.0.6.

---
updated-dependencies:
- dependency-name: org.keycloak:keycloak-admin-client
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

backend/build.gradle

@@ -44,7 +44,7 @@ dependencies {
     implementation "org.jetbrains.exposed:exposed-kotlin-datetime:0.54.0"
     implementation "org.jetbrains.kotlinx:kotlinx-datetime:0.6.1"
     implementation "org.hibernate.validator:hibernate-validator:8.0.1.Final"
-    implementation "org.keycloak:keycloak-admin-client:23.0.7"
+    implementation "org.keycloak:keycloak-admin-client:25.0.6"
 
     implementation "org.springframework.boot:spring-boot-starter-oauth2-resource-server"
     implementation "org.springframework.boot:spring-boot-starter-security"