chore(deps): bump keycloakVersion in /custom-user-federation-example

Bumps `keycloakVersion` from 26.4.0 to 26.4.2.

Updates `org.keycloak:keycloak-services` from 26.4.0 to 26.4.2
- [Release notes](https://github.com/keycloak/keycloak/releases)
- [Commits](keycloak/keycloak@26.4.0...26.4.2)

Updates `org.keycloak:keycloak-model-storage` from 26.4.0 to 26.4.2

---
updated-dependencies:
- dependency-name: org.keycloak:keycloak-services
  dependency-version: 26.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.keycloak:keycloak-model-storage
  dependency-version: 26.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

custom-user-federation-example/build.gradle

@@ -5,7 +5,7 @@ plugins {
 }
 
 ext {
-	keycloakVersion = '26.4.0'
+	keycloakVersion = '26.4.2'
 }
 
 dependencies {