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

Author: renovate[bot]

core/auth/example/docker-compose.yml

@@ -21,7 +21,7 @@ services:
     ports:
       - 3352:3352
   keycloak1:
-    image: quay.io/keycloak/keycloak:25.0.6
+    image: quay.io/keycloak/keycloak:26.2.5
     environment:
       DB_VENDOR: h2
       KEYCLOAK_ADMIN : admin
@@ -33,7 +33,7 @@ services:
     ports:
       - 3353:8080
   keycloak2:
-    image: quay.io/keycloak/keycloak:25.0.6
+    image: quay.io/keycloak/keycloak:26.2.5
     environment:
       DB_VENDOR: h2
       KEYCLOAK_ADMIN: admin