⬆️(dependencies) update quay.io/keycloak/keycloak Docker tag to v26.6

Author: renovate[bot]

compose.yml

@@ -68,7 +68,7 @@ services:
       - env.d/development/kc_postgresql.local
 
   keycloak:
-    image: quay.io/keycloak/keycloak:26.5
+    image: quay.io/keycloak/keycloak:26.6
     volumes:
       - ./docker/auth/realm.json:/opt/keycloak/data/import/realm.json
     command: