keycloak: update quay.io/keycloak/keycloak Docker tag to v26.0.6

Author: renovate[bot]

keycloak/kustomization.yaml

@@ -22,4 +22,4 @@ generators:
   - secret-generator.yaml
 images:
   - name: quay.io/keycloak/keycloak
-    newTag: 26.0.5@sha256:089b5898cb0ba151224c83aef3806538582880029eb5ea71c2afd00b627d4907
+    newTag: 26.0.6@sha256:a93d22e13b8641c683b7d5ccf6802a8ee177a21357ab7950228c7517ad1896c0