chore(deps): update keycloak/keycloak docker tag to v26.6.0

Author: renovate[bot]

keycloak/docker-compose.yml

@@ -2,7 +2,7 @@ version: '2'
 
 services:
   keycloak:
-    image: keycloak/keycloak:26.5.7
+    image: keycloak/keycloak:26.6.0
     environment:
       - KEYCLOAK_ADMIN=admin
       - KEYCLOAK_ADMIN_PASSWORD=admin