chore(deps): update quay.io/keycloak/keycloak docker tag to v26.4.6 (#22355)

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

ops/docker-compose/application/auth/keycloak/keycloak.yaml

@@ -12,7 +12,7 @@ services:
     depends_on:
       - coredns
       - postgres
-    image: quay.io/keycloak/keycloak:26.4.5
+    image: quay.io/keycloak/keycloak:26.4.6
     command: ["start-dev", "--import-realm"]
     container_name: keycloak
     init: true