keycloak: update quay.io/keycloak/keycloak Docker tag to v26.0.4

Author: renovate[bot]

keycloak/kustomization.yaml

@@ -22,4 +22,4 @@ generators:
   - secret-generator.yaml
 images:
   - name: quay.io/keycloak/keycloak
-    newTag: 26.0.1@sha256:2f8c9679b3e3e9e9d253a62834ae63fb0c0dae55d2b2e4133b6d3f07762f2257
+    newTag: 26.0.4@sha256:cb3c2f071b3fd1a00051699ac95acf72fdd464d0e23804150169fd3037cff506