chore(deps): update quay.io/keycloak/keycloak docker tag to v26.7.2

docker-compose.yml

@@ -2,7 +2,7 @@
 services:
   opencloud:
     # renovate: depName=opencloudeu/opencloud-rolling
-    image: ${OC_DOCKER_IMAGE:-opencloudeu/opencloud-rolling}:${OC_DOCKER_TAG:-7.5.0}
+    image: ${OC_DOCKER_IMAGE:-opencloudeu/opencloud-rolling}:${OC_DOCKER_TAG:-7.4.0}
     # changelog: https://github.com/opencloud-eu/opencloud/tree/main/changelog
     # release notes: https://docs.opencloud.eu/opencloud_release_notes.html
     user: ${OC_CONTAINER_UID_GID:-1000:1000}